My buddy just bought the Incredible today and I'm wondering how he can turn off 3G? I've always been Winmo and am unfamiliar with Android. Thanks
Why would you want to do that? You should have 3G all the damn time, Ive yet to drop 3G within the 20 square miles i drove today.
Battery Life? Compared to my Nexus (so far) the incredible is better because its not trying to force back and forth from 3G and Edge 99% of the day....Savor It!
thats all well and good, but some of us would like to disable 3g on occasion to ensure we get longer life, i've yet to find the option in the system settings, anyone know where it might be hidden.
Hold down the power button. Its the last option on the list "Mobile Network". It works as a toggle.
deekjx said:
Hold down the power button. Its the last option on the list "Mobile Network". It works as a toggle.
Click to expand...
Click to collapse
cheers, its kind of a solution (ie: turns off all data connections except wifi instead of just using edge).
deekjx said:
Hold down the power button. Its the last option on the list "Mobile Network". It works as a toggle.
Click to expand...
Click to collapse
this will turn off all the internet for it, TC is your friend trying to turn off 3g and just have it use 1x to save battery? or turn off all internet on the phone?
Yeah I figured out how to disable all data connections in Settings, but in my experience, whenever I turn off 3g I've had waaaayyyy better battery life. I am on ATT though...so it IS constantly going from 3G to Edge. I don't know if he'll be able to keep a 3G connection constantly, but I'm still wondering if turning it off will help.
arcteryxbird said:
Yeah I figured out how to disable all data connections in Settings, but in my experience, whenever I turn off 3g I've had waaaayyyy better battery life. I am on ATT though...so it IS constantly going from 3G to Edge. I don't know if he'll be able to keep a 3G connection constantly, but I'm still wondering if turning it off will help.
Click to expand...
Click to collapse
i was about to post the info but it got realy long so i made new post on it so its easier to find
forum.xda-developers.com/showthread.php?t=690682
- short version
- turn off 3G
phone screen > ##778 > "000000" > modem settings >
preferred mode- should be on auto as default, switch it to cdma only
menu > commit settings > (auto reboots)
poof 1x only mode!!!
--- also if this is just for battery life, biggest hits are
screen brightness, timeout
gps!,bluetooth,wifi(wifi can help battery in low 3g coverage but dont leave it one when your away)
email pulling ( gmail app with push is much more energy friendly if you can use just it and not the standardized mail program at all
other programs that do constant updating
Edit: oh and vibration uses more energy then audio and can be turned off, also haptic vibrate on selections and notification the have audio and vibrate
Has anyone proved that Using 3G wastes more power, I would think that the slower transfer speeds require more info transfered from your phone to download the information requested, and longer uptime waiting to view a webpage.
Why spend money on such a nice phone to browse with slow speeds.
Lino. said:
Has anyone proved that Using 3G wastes more power, I would think that the slower transfer speeds require more info transfered from your phone to download the information requested, and longer uptime waiting to view a webpage.
Why spend money on such a nice phone to browse with slow speeds.
Click to expand...
Click to collapse
hey i'm not saying i'm planning to use it myself, with the exception of when i go to gamble at the casino cause they have awful data interference
if your streaming videos or large file transfers the cell radio would actively broadcast for much longer time and would use more power going to youtube on it all day, but sometimes you know your gonna be away from a charger or just have to be on the run for while and while the phone has great data features sometimes you need the phone to be a phone and know that its reliable and their when you need it
of course it will have breakpoint where smaller data transfers will be more efficient, the largest benefit will be noticed when the phone is in your pocket maintaining its connection with cell towers
this will allow you to still receive emails in real time but give your phone radio less work to do
runkittyrun said:
i was about to post the info but it got realy long so i made new post on it so its easier to find
forum.xda-developers.com/showthread.php?t=690682
- short version
- turn off 3G
phone screen > ##778 > "000000" > modem settings >
preferred mode- should be on auto as default, switch it to cdma only
menu > commit settings > (auto reboots)
poof 1x only mode!!!
--- also if this is just for battery life, biggest hits are
screen brightness, timeout
gps!,bluetooth,wifi(wifi can help battery in low 3g coverage but dont leave it one when your away)
email pulling ( gmail app with push is much more energy friendly if you can use just it and not the standardized mail program at all
other programs that do constant updating
Edit: oh and vibration uses more energy then audio and can be turned off, also haptic vibrate on selections and notification the have audio and vibrate
Click to expand...
Click to collapse
What does all this even mean?
Related
Hey i know ive asked quite a lot of questions in the past but here i am with more.
1) I was wondering if there was an app to turn you data on and off so you switch from wifi to 3g data
2) I was also wondering how you can tell what your usage is mabye an app that doesn't count wifi as well.
There is an HTC Widget to turn the main radio off on the CDMA version. On my phone it is under:
Press "+" from the home screen-->HTC Widget-->Settings-->Mobile Network
On the CDMA phones that shuts down both voice and data. If you have a GSM version, i am not sure what it will do.
On the GSM version, if you just want to turn mobile data on and off but leave the phone "on", you can hold down the power button to bring up the "Phone Options" menu, and one of the options "Mobile network" - press this and it will toggle mobile data off and on.
Regards,
Dave
blood9656 said:
Hey i know ive asked quite a lot of questions in the past but here i am with more.
1) I was wondering if there was an app to turn you data on and off so you switch from wifi to 3g data
2) I was also wondering how you can tell what your usage is mabye an app that doesn't count wifi as well.
Click to expand...
Click to collapse
There's a couple of good apps for turning data on/off. The one I prefer is APNDroid as it's got a notification icon that can be displayed in the taskbar to indicate whether data is on or off. Placing a shortcut on your home screen make it easy to change whether data is active.
The app I use for monitoring data is NetCounter which is easy to use and clear to understand.
I recently used them both on a trip to Dubai as I wanted to prevent data roaming charges. APNDroid deactivated the data connection and at the end of the week long stay, NetCounter was showing zero data usage during the trip.
Thanks im also abit worried about all the ads that come with apps or games do they use much data and when an app like taskiller shows them still running does that mean they are using data?
And if i got my phone a week ago will it have the latest and fastest rom?
There's an HTC widget that allows you to switch wifi on and off, thus swapping from 2/3g to wifi. Also, take a look at Y5, its good for managing when you have wifi on / off.
Florida.
Ok ill have a look i was more worried about apps running in the background as ive found that when you press the home button they don't actuallly exit.
I suggest that what you really need is Netsentry. This will monitor the traffic on all the Hero network interfaces (usb, Wi-Fi, 2G/3G) and warn you when any particular interface hits a user defined limit. It will also "self-reset" the counters according to a schedule that you define.
For example, say you are on Orange with their miserly 500mb data limit, and you're billing cycle starts on 1st on the month, you could set up Netsentry to warn you when you get to say 475mb, and automatically reset the counter on the 1st of every month.
I'm sure there are other apps that do something similar, or even better, but Netsentry seems to work well enough for me.
Regards,
Dave
Ok, this may seem VERY obvious for many, but thought it was worth a mention.
On the N7105, under Settings > Wireless & Network > More Settings > Mobile Networks,
the "Network Mode" option has LTE/GSM/WCDMA (Auto/4G), GSM only(Edge/2G), WCDMA only (3G/HSPA+) .
When using data in passive mode, like letting emails, notifications, contacts, s/media etc sync in the background, if you leave it on GSM only, I'm guessing it'll take up a lot less battery.
And every now and then when you need to browse or stream etc, you can temporarily set it to LTE/Auto or WCDMA depending on the data load (like WCDMA for audio streaming; LTE/Auto for video streaming).
I'm sure there's widgets that do it from the homescreen too.
And I guess the same applies for the N7100, except for the LTE part.
For anyone on 3 in the UK wanting to try this, 3 doesn't have a 2g/GSM only network.
Thanx for the tip
While this is true, I can't stand it. This is coming from me! I used to keep my Blackberries always on 2G. But the problem is if you do anything OTHER than receive emails or send messages, then it's too slow.
Not to mention anything over data via 2G or 2.5G (Edge) cuts off your phone line as it's using the data connection and you can't handle voice and data over over 2 or 2.5G. Be warned! You're going to miss a lot of phone calls!
If you receive a call it will cut out the data connection. Not the other way round
You won't miss any calls...
By the way everyone, check out opera mini! Set image quality to low and pages load pretty quickly over 2.5g and decently over 2g.
Sent from my GT-N7100 using xda premium
Cmon guys. . This phone is the mother of all smart phones in regards of battery. ..you need these tricks only if you are stuck on a desolated Island. ..
handwritten from my note 2 (N7100)
I will also have to agree with the previous post. I get almost 2 solid days if not a little more of battery life on this thing. Changing the 4G setting only takes away the full ability of what my "little monster" has to offer.
Sent from my SCH-I605 using xda premium
SirCanealot said:
If you receive a call it will cut out the data connection. Not the other way round
You won't miss any calls...
By the way everyone, check out opera mini! Set image quality to low and pages load pretty quickly over 2.5g and decently over 2g.
Sent from my GT-N7100 using xda premium
Click to expand...
Click to collapse
Actually, yeah!
It happens to my mom and me all the time. At my moms house she doesn't use wifi, and she leaves it on GPRS. if she's chatting on whatsapp, the phone call goes to the answering machine because it's being transmitted over the same radio! So her being online holds up the line. I'd suggest you try it Turn on GPRS and browse the web and while loading a site give yourself a call.
Never ceases 2 amaze me how people use all kind of tricks, from Uv, Uc, to what the op does...etc etc...ending up with nothing more than a dumb phone with a big screen!
I paid the full price n I want to use the full potentiel, n how big of a deal is it to plug to a power outlet? unless ur in the middle of nowhere, in which case u'll have no use 4 the phone anyways!
Peace 2 all.
Well, people only end up "using" the phone for a few hours (in terms of screen time), and for the majority of the day, it's just passively doing it's thing. So if you had some widget set up for a quick 2/3/4G swap, for the great majority of the day, it wouldn't really make a difference in your experience with the phone. It'd just mean you wouldn't have to worry about running low on juice when you actually ARE using it for content/media/social media etc.
But that is, if you can be bothered The battery's great eitherway!
Re: missing calls on 2G when data is on, I guess it might be carrier specific (as to whether they prioritize pushing through phone calls over data); wouldn't really know. But in my case, the phone calls seem to tend to come through...
Anyway, as I do tend to use the phone quite a lot (multi tasking, a/v streaming, photography/editing, media uploading and more, all at a 'decent' brightness) and am out and about till late regularly, I've realized, putting in that little bit of effort when I'm not doing all that makes a noticeable difference by night time.
But if/when all else fails...spare battery
SirCanealot said:
If you receive a call it will cut out the data connection. Not the other way round
You won't miss any calls...
By the way everyone, check out opera mini! Set image quality to low and pages load pretty quickly over 2.5g and decently over 2g.
Sent from my GT-N7100 using xda premium
Click to expand...
Click to collapse
This is exactly what I do when I'm not really using the phone too much and its mostly in my pocket. Taking it out for a few minutes every now and then I use Opera Mini and the speed over 2.5g is acceptable enough. This is a huge battery saver if you need the phone to last as long as possible when you know you'll be away from a charging point for a few days.
Sent from my GT-N7100 using xda app-developers app
if anyone knows of a widget that can directly toggle between 2G and 3G or 4G, i'd love to know about it because samsung implemented network switching differently from AOSP so apps that work on AOSP doesn't work on samsung, at least as far as I can tell. Even having root is useless, I still can't find a widget capable of directly toggling the networks...
lukesky said:
if anyone knows of a widget that can directly toggle between 2G and 3G or 4G, i'd love to know about it because samsung implemented network switching differently from AOSP so apps that work on AOSP doesn't work on samsung, at least as far as I can tell. Even having root is useless, I still can't find a widget capable of directly toggling the networks...
Click to expand...
Click to collapse
For the time being, I've to a shortcut widget to "Mobile Networks" (Power Toggles -> 2G/3G) on my homescreen, and I switch it from there. It's one extra click, but I guess I can live with it!
spade4 said:
For the time being, I've to a shortcut widget to "Mobile Networks" (Power Toggles -> 2G/3G) on my homescreen, and I switch it from there. It's one extra click, but I guess I can live with it!
Click to expand...
Click to collapse
I've got a widget for the shortcut too, but it's more than 1 extra click right? You have to click the widget, then Network mode, click the mode you want, then click OK, then it will swap modes. That's 4 clicks. On AOSP based roms, it's just 1 click. Guess it's probably a limitation of samsung roms.
So when I posted about switching the original note 1 to edge or gsm only to save battery everyone told me I was crazy and it didn't save any battery but now this is a tip?
lukesky said:
I've got a widget for the shortcut too, but it's more than 1 extra click right? You have to click the widget, then Network mode, click the mode you want, then click OK, then it will swap modes. That's 4 clicks. On AOSP based roms, it's just 1 click. Guess it's probably a limitation of samsung roms.
Click to expand...
Click to collapse
Actually, come to think about it you're right! I guess I'd just gotten used to it.
Wonder if there was a way to do it via 'Tasker'?
mazdamiata210 said:
So when I posted about sing the original note 1 to edge or gsm only to save battery everyone told me I was crazy and it didn't save any battery but now this is a tip?
Click to expand...
Click to collapse
You would have been right! it definitely does. The battery consumption difference between 4G and 2G is fairly significant...
spade4 said:
Actually, come to think about it you're right! I guess I'd just gotten used to it.
Wonder if there was a way to do it via 'Tasker'?
Click to expand...
Click to collapse
I tried it on my previous S3 before and Tasker couldn't toggle it either.
Related to the missed calls when on 2G.
That depends of wich model you're using.
CDMA (example: Sprint) will allow you to use data, but data connection will not be available if you place a call. And if you're browsing the web, or downloading something, calls go directly to voicemail
GSM (example: AT&T) will allows you to browse data when you're on 2G, BUT, you can be able to receive calls even if you're downloading something, but the data connection will me cut off until you finish the call.
That's the main difference about how the modems and radio works between each technology.
spade4 said:
You would have been right! it definitely does. The battery consumption difference between 4G and 2G is fairly significant...
Click to expand...
Click to collapse
Yup well you can read all the comments telling me what I wanted to do was useless and pointless here when I know for a fact I was right...
http://forum.xda-developers.com/showthread.php?t=1730601
I have the Verizon G2. On previous phones, after I connect to wifi, i'm used to the 3g/4g logo disappearing from the notifications bar because the phone is smart enough to disable mobile data when wifi is working. I thought this was a standard stock feature.
I'm noticing on this device that those logos remain. I have a really poor signal in my office building so it switches from 3g-4g all day long. Obviously I can manually disable mobile data, or even use some apps to disable it automatically I'm sure, if that's necessary. Does anyone have a better understanding of how this works than I do?
I actually haven't noticed much impact to battery life so I'm not sure if it's something that even needs to be manually disabled? It's just confusing me why it would even bother trying to find 3g/4g signals when wifi is working and connected.
Edit: Well this convinced me to finally spend 5 minutes learning how to use Tasker and I set up a really basic profile to turn data on/off depending on my wifi connection. I'm still not sure how necessary it is but maybe I'll compare battery life with it enabled or not enabled.
Im having the same problem. Is Tasker an app u purchased? Have u noticed any difference in battery life? Thanks
usefulidiot127 said:
I have the Verizon G2.On previous phones, after I connect to wifi, i'm used to the 3g/4g logo disappearing from the notifications bar because the phone is smart enough to disable mobile data when wifi is working. I thought this was a standard stock feature.
I'm noticing on this device that those logos remain. I have a really poor signal in my office building so it switches from 3g-4g all day long. Obviously I can manually disable mobile data, or even use some apps to disable it automatically I'm sure, if that's necessary. Does anyone have a better understanding of how this works than I do?
I actually haven't noticed much impact to battery life so I'm not sure if it's something that even needs to be manually disabled? It's just confusing me why it would even bother trying to find 3g/4g signals when wifi is working and connected.
Edit: Well this convinced me to finally spend 5 minutes learning how to use Tasker and I set up a really basic profile to turn data on/off depending on my wifi connection. I'm still not sure how necessary it is but maybe I'll compare battery life with it enabled or not enabled.
Click to expand...
Click to collapse
data has to be on because that's how sms and mms are sent. Nothing changed between phones other than the images are showing up on this one.
I'm guessing a lot of people on here know this already but I recently discovered how to massively increase my Moto X's battery duration. Namely by switching off Mobile Data, I can then go a full 14 hours only dropping down to around 75% by the end. So now as soon as I get into work or any place where I'm on Wifi I switch off mobile data.
Makes me wonder why having mobile data switched on is expending so much battery power?
If you wanna increase that even further, just turn the whole thing off. The battery will last for weeks.
teh_lorax said:
If you wanna increase that even further, just turn the whole thing off. The battery will last for weeks.
Click to expand...
Click to collapse
He actually has a point, there's no point on being sarcastic over a good advice that should be logical by now.
rogeriorp said:
He actually has a point, there's no point on being sarcastic over a good advice that should be logical by now.
Click to expand...
Click to collapse
Yes, turning off (necessary) features saves battery. This is not shocking.
teh_lorax said:
Yes, turning off (necessary) features saves battery. This is not shocking.
Click to expand...
Click to collapse
It is not shocking but somehow people tend to forget the basics. And it is also unnecessary while on wifi, which is the case and the advice he spoke of.
And I'd go even further and set 3G only with wifi, lollipop tends to switch from wifi to LTE by itself very often.
I've heard of people suggesting switching off wifi when your not using it, but never mobile data. So i just thought it might be a suggestion some people might appreciate. Take it or leave it.
Plus wifi is doing the exact same funtion as mobile data when your connected to it, so your not losing any functionality.
If your rooted you can even get Tasker to do the switch automatically.
This actually doesn't work. The data radio goes I to sleep mode when WiFi is on. Its not just doing its own thing while wood is on.
Definitely working on WiFi enhances battery life enormously but didn't try switching off mobile data
Zammo76 said:
I'm guessing a lot of people on here know this already but I recently discovered how to massively increase my Moto X's battery duration. Namely by switching off Mobile Data, I can then go a full 14 hours only dropping down to around 75% by the end. So now as soon as I get into work or any place where I'm on Wifi I switch off mobile data.
Makes me wonder why having mobile data switched on is expending so much battery power?
Click to expand...
Click to collapse
How is this possible? When your wifi radio is connected, the data side is completely disconnected. This is even reported in your 'status'.
I see your point, but all I know is that it definitely is making a large difference for me.
One theory I attributed it with was that with Wifi and Mobile Data switched on the phone is getting a lot more Wake Locks (perhaps doubling up), which in turn could also possibly be preventing the phone going into a Deep Sleep. But as the Wakelock detector app doesn't work any more (unless your rooted), I can't verify this.
Gonna test this out!
The issue with turning off mobile data is that it will cause problems with sending and receiving MMS, you may also have problems with SMS as well.
My HTC Sensation was really good at basically putting the radio to sleep when on Wifi and only waking when needing to send or receive data that will only work over the cell network.
Zammo76 said:
I'm guessing a lot of people on here know this already but I recently discovered how to massively increase my Moto X's battery duration. Namely by switching off Mobile Data, I can then go a full 14 hours only dropping down to around 75% by the end. So now as soon as I get into work or any place where I'm on Wifi I switch off mobile data.
Makes me wonder why having mobile data switched on is expending so much battery power?
Click to expand...
Click to collapse
I don't disable mobile data, but I do use tasker to switch to 3G when I'm connected to wifi. The LTE radio uses a lot more battery in poor signal areas (like my apartment) and I have noticed it helps me go from about 3 hours of screen time to 4.5. I think the MMS issues are a good point and I feel like this solution is slightly more elegant because even with mobile data disabled, the phone is still holding an LTE signal. Ymmv, obviously
mrapp said:
I don't disable mobile data, but I do use tasker to switch to 3G when I'm connected to wifi. The LTE radio uses a lot more battery in poor signal areas (like my apartment) and I have noticed it helps me go from about 3 hours of screen time to 4.5. I think the MMS issues are a good point and I feel like this solution is slightly more elegant because even with mobile data disabled, the phone is still holding an LTE signal. Ymmv, obviously
Click to expand...
Click to collapse
Hi can you explain whats the settings on tasker to do such a thing? Ive never used it but I have heard good things and just bought the app!
unk3 said:
Hi can you explain whats the settings on tasker to do such a thing? Ive never used it but I have heard good things and just bought the app!
Click to expand...
Click to collapse
First you'll need root and this plugin (make sure to enable external access in the plugin app)
Basically, create a profile that runs whenever you connect to a network (you can leave it blank for all networks or press the search button to choose just your home network).
The entry task would basically wait 10 seconds and then run the plugin choosing wcdma/gsm (auto) as the network mode. Choose then to add an exit task which simply recalls the plugin and chooses the network mode as LTE, wcdma, gsm. You can even add an extra step to each task at the end which has tasker display a toast that you can have say LTE enabled or 3g mode only
BrokenWall said:
The issue with turning off mobile data is that it will cause problems with sending and receiving MMS, you may also have problems with SMS as well.
My HTC Sensation was really good at basically putting the radio to sleep when on Wifi and only waking when needing to send or receive data that will only work over the cell network.
Click to expand...
Click to collapse
SMS/MMS are sent via voice channels, not data.
floepie said:
SMS/MMS are sent via voice channels, not data.
Click to expand...
Click to collapse
SMS is sent over Voice channels. MMS still requires data.
I double checked and tested this on my Pure Edition on T-Mobile.
Disabled Wifi and Cellular Data
Sent a standard text message, it was received by the other party. Attempted to send a photo message, it was not able to send from my phone as well as the other party did not receive it. Though it did resend when data was enabled.
Tasker can't turn off mobile data since Lollipop update....
Any sugestions?
BrokenWall said:
SMS is sent over Voice channels. MMS still requires data.
I double checked and tested this on my Pure Edition on T-Mobile.
Disabled Wifi and Cellular Data
Sent a standard text message, it was received by the other party. Attempted to send a photo message, it was not able to send from my phone as well as the other party did not receive it. Though it did resend when data was enabled.
Click to expand...
Click to collapse
No one sends MMS messages now (apart from old people), since the advent of Whats app and the like, so its hardly a deal breaker.
Zammo76 said:
No one sends MMS messages now (apart from old people), since the advent of Whats app and the like, so its hardly a deal breaker.
Click to expand...
Click to collapse
Troll alert
So when I first got my V20 (VS996), when wifi was connected the mobile data went inactive- at least I'm presuming so, the '4G' was grayed out, not crossed out, and when there's simply no 4G signal it entirely disappears (or drops to 3G etc). But now it ALMOST never does this anymore... every once in a while it will, but there's nothing specific about times it does.
I'm pretty sure that's what it's supposed to be doing, as there's even an option 'Cellular data always active - Always keep mobile data active, even when Wi-Fi is active [...]' (not enabled). I've searched high and low for a setting that could be causing it not to work right, and information about this, but have come up dry. Is anyone familiar with this? Really didn't want to have to reset and track it that way.
Thanks.
Bad WiFi signal bro. Disable your gsm data and see if you can still watch YouTube.
Sent from my LG-H990 using XDA-Developers Legacy app
fafalone said:
So when I first got my V20 (VS996), when wifi was connected the mobile data went inactive- at least I'm presuming so, the '4G' was grayed out, not crossed out, and when there's simply no 4G signal it entirely disappears (or drops to 3G etc). But now it ALMOST never does this anymore... every once in a while it will, but there's nothing specific about times it does.
I'm pretty sure that's what it's supposed to be doing, as there's even an option 'Cellular data always active - Always keep mobile data active, even when Wi-Fi is active [...]' (not enabled). I've searched high and low for a setting that could be causing it not to work right, and information about this, but have come up dry. Is anyone familiar with this? Really didn't want to have to reset and track it that way.
Thanks.
Click to expand...
Click to collapse
developer options
keep mobile data always on
as well as agressive wifi to cellular handoff
as well as under advanced for wifi, you can tell it to switch more agressively off wifi under poor conditions etc
somemadcaaant said:
Bad WiFi signal bro. Disable your gsm data and see if you can still watch YouTube.
Sent from my LG-H990 using XDA-Developers Legacy app
Click to expand...
Click to collapse
Bad WiFi doesn't seem to be the issue. It's showing max strength and is 2 feet away from the wireless router under my desk, and the issue still persists. (yes, youtube plays fine in HD)
Team DevDigitel said:
developer options
keep mobile data always on
as well as agressive wifi to cellular handoff
as well as under advanced for wifi, you can tell it to switch more agressively off wifi under poor conditions etc
Click to expand...
Click to collapse
I'm trying to get it to turn mobile data off, not hand off to it even easier. Are you saying that these options will make it disable mobile data when wifi is good, when it's not even doing that without them? Tried that just in case, it's still not deactivating mobile data (still at my desk, wifi router for 100mbps symmetric fiber showing full strength 2' away, so unlikely bad signal)
Edit: I may have found the issue. It appears one of the Verizon apps was forcing the cell connection to stay alive. I tried killing a bunch of the ones I wasn't using after recalling how their voicemail app only runs over cellular, and now mobile data is deactivated. I'll need more trial and error to confirm which one was doing it.. I killed 4 of them.. and it stayed off after re-launch so was clearly some kind of bug. Although it's odd as it did persist through reboots.
Edit: Confirmed; it's the 'Caller Name ID' app. Ending that single process restores the normal mobile data deactivation when wi-fi is good.
So another cause of this problem has popped up. After a reboot, 4G was becoming active after 15-30 minutes despite not touching the phone at all since the reboot, and there were no apps that could be killed to get it to switch off this time. But after a lot of trial and error, the cause was finally isolated: The My Verizon data meter widget. Once it refreshes, it forces cellular data to stay on, even when Wi-Fi is connected and strong. Once the widget was removed from the home screen, 4G never came back on while using WiFi.
Is there any way to disallow an app from using 4G but still allow it to use WiFi? I really would like a better solution than just not being able to use the widget. It would be fine if it just connected, got its update, then disconnected... but no, it's on permanently after a refresh.