Something strange since my upgrade to 1.66 - when the phone's in standby it appears to be establishing an active 3G connection, and when i wake (unlock) the phone, you can watch as it reconnects to the current wifi connection again. Is this some sort of energy saving strategy, which could theoretically run your 3G bill up? (dont matter to me as mine is unlimited, but not all are).
Anyone else notice/know about this?
By default, Wifi is disabled during standby to save power. So if a program requests an internet connection, for example outlook if you configured it to check mail automatically, the phone will connect the data connection.
You can search for "wifinostandby" to find a fix that disables auto wifi power off.
But beware that current consumption with wifi on is substantially higher than when it's off, by 10 times (current draw is about 50mA vs 5 for "true" standby), meaning you get at best 30h standby life if doing nothing else.
Also, dont forget that the top bar shows you the connetion being offered by your network, it doesn't necessarily mean it's doing anything. If you disable the wifif you see the same 3g icon regardless of what data is doing. So as said above, you go to standby, wifi is disabled so the wifi icon vanishes, then if you have your phone in 3g mode (personally mine stays in gsm mode, so i see an E not a H) when you wake it up it will display the H before the wifi kicks in and the icon changes back to wifi again.
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since I got my jasjar I I saw,sometimes, the battery was drained at 50% without using my jasjar in 3 or 4 hours. only one or two short phone calls. no msn running or any application. I have written a little C program that writes to a log file each 10 seconds the actual time(hour, minute and second) . ok, if there isn't 3g connection (of course, no programs running), and I turned off the device and when I turn on the device 5 minutes later I could see the CPU hasn't been running, so minimal battery drain. But if I do the same test but connected to UMTS (again no programs running, only the test program) I could see that my test program many times continues working many minutes, so cpu is working (i turned off the device), then it stops few seconfs, again It continues working....(the screen was turned off). so......be carefull if you turn off your jasjar with the umts connection active. while you think that your device is turned off and you are saving battery......its possible the cpu is running eating the battery.
and how do you disable UMTS and just leave GPRS on????
mmm, i simply disconnect the umts connection if i am going to turn off the device....
I have seen that my JASJAR is sporadically sending/receiving data in the background even if the applications are apparently inactive. This is causing the radio connection to stay up for a long time. Especially on Vodafone Spain UMTS network radio connections are kept for ~20seconds after the user data is sent.
The only application I had running was ActiveSync, with an update period of 5 minutes. However, within the 5 minutes I can see activity in the channel every 40 seconds approximately, even when ActiveSync has finished synching.
Anyone knows of any good packet sniffer for WM5.0 to identify exactly what that traffic is for?
As a consequence of what I think is background ActiveSync traffic, radio transmission is performed for a considerable amount of time (radio channel is active 33% of the time in my case), which drains battery extremely quickly.
This is related to this specific network implementation (all data sent on CELL_DCH mode, for those who understand UMTS RRM, though this is very likely to change in the near future), while other operators are using CELL_FACH, more similar to GPRS behaviour and more efficient in terms of battery usage. What network operator are you using?
If you want to avoid the UMTS network in order to maximise battery you can force the phone into GPRS only mode in Settings-->Phone-->Band and changing from Automatic to GSM... at the cost of not having video-calls, simultaneous voice+data or high download speeds.
Thank you y gracias !!!
If you want to avoid the UMTS network in order to maximise battery you can force the phone into GPRS only mode in Settings-->Phone-->Band and changing from Automatic to GSM... at the cost of not having video-calls, simultaneous voice+data or high download speeds.
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I have done this and ive noticed i have alot better signal strength now,
really, before i could never get over 1 bar and often saw it was scanning to try and find a network, now im nearlly allways all bars,
I dont use UMTS so im well happy with this setup
When I'm at home I use WiFi and the 3G icon is off. As long as I'm actively using the phone this seems to be the case.
I've noticed on more than one occasion that when I unlock the phone after a prolonged "sleep" it is connected to 3G and switches back to WiFi!
Anyone else seen this?
Is there an explanation?
I have noticed this too and I have my WiFi sleep policy set to Never (check yours perhaps).
A little bug I would say.
Unless you've adjusted the wifi sleep policy, this is normal behaviour.
By default, when the screen switches off, so does wifi.
The Jones said:
I have noticed this too and I have my WiFi sleep policy set to Never (check yours perhaps).
A little bug I would say.
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HA! Another Advanced settings menu under the WiFi settings menu.
My WiFi sleep policy was "When Screen Turns Off". Sneaky.
Changed it to "Never". Let's see what happens.
With SYNC ALWAYS for e-mail/facebook/twitter, which uses more power/drains battery faster: WiFi or 3G?
I'm pretty sure Wifi is nicer on the battery than 3G, at least from what I've read and my own experience.
It depends on your signal from both (which equals required trasmitting power), I'd say.
WiFi power is pretty much constant, 3G/HSDPA can vary and get much higher than WiFi.
I have read that when you are connected to WiFi, it is always slightly better for power (I am sure range and signal strength do come into play though).
When you are not connected to WiFi, then the wireless uses loads of power trying to hunt a network down.
Hello. I'm sure that this must have been discussed but I cannot find the answer using search. As is surely normal, I use WiFi within the home and GPRS when there is no WiFi available. If WiFi is connected and I go out for a short while, then when I get back in a WiFi area, the WiFi is still connected. However, if I go away for a long time, and GPRS is used for perhaps a regular weather update, then the WiFi disconnects and has to be manually reconnected upon return to home. This leads to GPRS being used in a WiFi area unnecessarily if you forget to re-connect WiFi. Is there a WiFi connection timeout value or any other setting that can be changed? My old TyTN II did not have this problem. Thanks.
Try this CAB
It disable disconnecting WiFi when phone is in sleep mode and with this phone automaticly connects to WiFi when Leo will be in range.
Thanks Franq_23_pl. I think that the CAB just stops WiFi disconnecting when the device is in sleep mode. That will just drain the battery, surely? My old TyTN used to disable WiFi when in sleep mode, but as soon as you switched it on again, WiFi would be enabled and it would connect if in range. The problem with my HD2/Leo is that if I am away from my WiFi for some considerable time (ie, most of the day), then when I get back home and switch the device on, WiFi is disabled, and I have to manually toggle in on. So my question is..... What are the circumstances that cause WiFi to disable itself, and Is there some way of stopping it happening?
OIC now. I think you having some battery saving app and this app turning off WiFi when iz not used. What apps or registry mods you have installed on Leo?
You have the same behavior after hard reset?
My Leo don't disable WiFi. When i go outside (for ex to work) and back after few hours my Leo connecting to my home wireless network automaticly.
I remember, that i had the same problem like you and it was caused by app, which had duty to save battery.
I would like to know the differences in battery life 3g vs Wifi. I also would like to know if the focus automatically cuts out 3g to use wifi; as i understand wifi is more efficient and usually faster bandwith rate. How do people have there settings configured wifi and data on, wifi no data, or data and no wifi?
wi-fi uses less battery and faster in general than 3G when actively transmitting data. Wi-fi uses more battery than 3G when your phone is standby and not transmitting much data.
Wi-fi will automatically cut off 3G when it is activated. However, if your phone is not plugged in, wi-fi will automatically be turned off when phone screen turns off.
I have data toggled off, and wifi on, I am revceiving text messages when the screen is turned off. Would that mean wifi hibernates and wakes up when someone is trying to contact the phone or that the wifi is on even when the screen is off?
Text message does not use wi-fi or Cell data. It is the same as voice calls.
You can tell that your wi-fi is off while sleep when you turn the phone on and look at the wi-fi icon.
There is really no reason the manually turn off the cell data unless you don't want to use it at all. Just remember to keep the phone plugged in when you have wi-fi access.
For me its pretty much the opposite. Having wifi on drains my battery very fast, even if I hardly use the phone. My battery is totally dead with very light usage by the end of the day. Turn off wifi and I'm still at 50% by the end of the day with the same usage. It's bad enough that I just don't use it anymore.
willp2 said:
For me its pretty much the opposite. Having wifi on drains my battery very fast, even if I hardly use the phone.
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That's exactly what I have posted above. Nothing is opposite about what you have experienced. If you don't use data much, wi-fi ends up use more battery than 3G. If you use a lot of data, e.g. browsing internet for hours, 3G uses more battery than wi-fi.
You guys might want to read this... http://www.istartedsomething.com/20...mance-discrepancy-battery-and-agents-tidbits/
Michael.
Michael, awesome article so officially wifi uses less than 3g. furthermore, if you use wifi and your screen goes off the wifi rests until your screen is back on using even less battery.
Power (mW) 3G (700) vs. Wifi (650)
Hi all, I want to present a scenario in which 3G data and wifi both are turned on at the same time. Android gives priority to wifi connection and uses it. In wifi "advanced settings":
1. Network notification is TURNED OFF
2. Keep Wifi on during sleep is set to ALWAYS.
Now suppose the Wifi signal is no more available maybe because of a power failure at the Router's end, Android switches over to "Data" connection. In this case, will the android continously search for the lost wifi signal and hence consumes a significant amount of battery power?
Thanks in advance