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Note 4 (SM-N910F) dropping calls and can't receive calls when 4G enabled

Hi All,
I have a Galaxy Note 4 SM-N910F with BTU firmware N910FXXU1ANK4 (UK) which I flashed from the older O2 UK firmware N910FXXU1ANJ4 when I bought it.
I am having problems receiving calls and making calls when 4G LTE is enabled on the phone (I get 4G signal bar). When someone calls me my phone rings and the signal bar is 3-5 bars usually and when I slide to answer the phone it seems to answer (timer starts clocking up) and I can't hear anything (sometimes for a split second) and the other person can't hear me, then the person is directly kicked to my voice mail!
If I try to make outgoing calls with 4G enabled it sometimes works but other times it sits there saying "dialling..." then after 10 second or so gives up and stops. If I do manage to call out I get terrible phone recetion breaking up and high pitched noises sometimes. Sometimes it is ok for a while talking but eventually the call drops at some stage.
If I force my phone into 2G only or 2G/3G only then the phone seems to work completely normally.
I have had multiple SIM swaps with no luck.
Samsung walk in repair centre was useless as the empolyees all appeared to be undertrained kids.
O2 was no use saying there is no transmitter faults reported in my area.
Before I try a hard reset and flashing back to the old O2 firmware and then possibly sending my phone away for repair, is there anything else that might be going on here? Has anyone else seen this or know if it is a known problem?
Cheers,
Richard.

laxity said:
Hi All,
I have a Galaxy Note 4 SM-N910F with BTU firmware N910FXXU1ANK4 (UK) which I flashed from the older O2 UK firmware N910FXXU1ANJ4 when I bought it.
I am having problems receiving calls and making calls when 4G LTE is enabled on the phone (I get 4G signal bar). When someone calls me my phone rings and the signal bar is 3-5 bars usually and when I slide to answer the phone it seems to answer (timer starts clocking up) and I can't hear anything (sometimes for a split second) and the other person can't hear me, then the person is directly kicked to my voice mail!
If I try to make outgoing calls with 4G enabled it sometimes works but other times it sits there saying "dialling..." then after 10 second or so gives up and stops. If I do manage to call out I get terrible phone recetion breaking up and high pitched noises sometimes. Sometimes it is ok for a while talking but eventually the call drops at some stage.
If I force my phone into 2G only or 2G/3G only then the phone seems to work completely normally.
I have had multiple SIM swaps with no luck.
Samsung walk in repair centre was useless as the empolyees all appeared to be undertrained kids.
O2 was no use saying there is no transmitter faults reported in my area.
Before I try a hard reset and flashing back to the old O2 firmware and then possibly sending my phone away for repair, is there anything else that might be going on here? Has anyone else seen this or know if it is a known problem?
Cheers,
Richard.
Click to expand...
Click to collapse
Most mobile providers still don't support VoLTE (don't know if that is the case in UK) so your phone needs to go down to 3g/2g when phone call is received.. So maybe there is some problem between BTU and O2 firmware (I am no expert, but may be CSC related)..
I suppose your network selection on 4g/3g/2g automatic mode, not LTE (4G only)?

velimr said:
I suppose your network selection on 4g/3g/2g automatic mode, not LTE (4G only)?
Click to expand...
Click to collapse
I only have the option of :
LTE/WCDMA/GSM (auto connect) - Have the issues with this mode
WCDMA/GSM (auto connect) - No issues in this mode
WCDMA only - not tested
GSM only - No issues in this mode.

In phone dialer hit settings. There should be a volte toggle if there is turn it off.

I don't have any issue like that. 4G turns to 3G or 2G when receiving/taking a call. May be u hav an issue with ur firmware

I've tried flashing back from the BTU UK firmware back to the original O2 UK firmware and the problem remains. I also tried a hard reset afterwards leaving the same issue.
I have noticed that the issue does occur with 3G as well as 4G but it seems to be a bit more stable. 2G seems the most stable.
I have arranged with Samsung to send my Note 4 for repair so hopefully that will resolve the issues.

I have the same problem using 4G. Sent for replacement. Waiting for feedback..

got information that warranty service did find the problem and in a week or so I will get new one

I HAVE THE SAME PROBLEM!!!! THANKS A LOT !!!!! I WAS LIKE CRAZY TRYING WHAT CAN BE WRONG WITH THIS....
In my situation i can
send and receive sms on all mods
I can call in 4g but i can't receive calls when im on 4g... - just only hire is a issue
Last time my charger when i was charging in night get burn and i think meybe form that time... i have phone 3 weeks brand new.

[Q] Stuck on "EDGE". How can I change the Network under "SIM Status" ?

[Q] Stuck on "EDGE". How can I change the Network under "SIM Status" ?
I'm running Dirty Unicorns 9.8 OFFICIAL (5.1.1) on my Nexus 4. The other day I noticed I had like one or two bars so went into Settings > About phone > Status > SIM Status and clicked "Network". Usually, there are a handful of providers to use there and sometimes changing to a different one improves my reception (This is a T-Mobile phone). I don't remember what I left it on.
Today the phone is stuck on "EDGE" under "Cellular Network Type". I tried to get back in the "Network" to check and see if I left it on something stupid, but I can't get back into the provider selection. No matter what I do, the device won't hook up to "LTE" (whatever HSPA/HSPA+ thing T-mo says is LTE). Everything worked fine last week. Haven't applied any patches or anything other than messing around with the Network settings. Any idea what I might try? Is there a magic dialpad entry to use to reset the Network?
Thanks

eris170 said:
I'm running Dirty Unicorns 9.8 OFFICIAL (5.1.1) on my Nexus 4. The other day I noticed I had like one or two bars so went into Settings > About phone > Status > SIM Status and clicked "Network". Usually, there are a handful of providers to use there and sometimes changing to a different one improves my reception (This is a T-Mobile phone). I don't remember what I left it on.
Today the phone is stuck on "EDGE" under "Cellular Network Type". I tried to get back in the "Network" to check and see if I left it on something stupid, but I can't get back into the provider selection. No matter what I do, the device won't hook up to "LTE" (whatever HSPA/HSPA+ thing T-mo says is LTE). Everything worked fine last week. Haven't applied any patches or anything other than messing around with the Network settings. Any idea what I might try? Is there a magic dialpad entry to use to reset the Network?
Thanks
Click to expand...
Click to collapse
Same problem here with metro pcs who uses T-mobile

After a few days of this, and several chats and calls to T-Mobile, it seems T-Mobile is "working on towers" in my area and things will be like this for a few days. The situation is this according to the last phone call with T-mobile:
* HSPA+ is no longer available on the towers in my area
* LTE and GSM (Edge) are the only supported modes
* LTE is not supported on the Nexus 4. tuff-shizz. buy a new phone.
Ok well this sucks... so here's what I did in the past couple days.
* Installed Chroma ROM and the the LTEEnable zip file thing floating around all the forums here.
* Found out Chroma was a rebranded AOSP ripoff so uninstalled it.
* flashed Dirty Unicorns 6.0.1 to my Nexus 4, bluetooth seemed funky so flashed the .33 radio from "dmitry" ROM that I found on several threads. Also flashed LTEEnable zip, not sure I needed it. LTE now working.
* dialed *#*#4636#*#* and went into "Phone Info"
* Network Type: "LTE"
* Set Preferred Network Type: LTE/GSM (PRL) -- originally had this set to "LTE only" but no voice calls could go out, or come in.
You would think this is the end of story, but wait. Voice calling takes 20 seconds to connect (even voice mail). With "LTE only" settings all incoming calls go directly to voice mail. never even rings the phone. Are you shizzing me?? With "LTE/GSM (PRL)" the phone waits for 20 seconds to drop from LTE back to "Edge" before the call finally hooks up.
Today, found out nexus 4 doesn't do VOLTE (Voice Over LTE). at least thats what google said. That would explain the Drop to "Edge" when dialing out.
Thing is, I tried this with a NEXUS 5 on my account, using two different sims , running stock Android Whatever on the N5 and it does the EXACT SAME THING. dropping calls to "Edge" before connecting. Takes 20 seconds to dial out. Incoming calls on LTE (which the n5 runs by default) all go to voicemail.
So it seems the workaround now is to dial the "magic number" above and set the "Preferred Network" to "GSM only" (Edge). That's the only way to get phone calls in or out of either device on T-Mobile's network today. Don't bother trying to Google anything though because it won't re-connect to LTE to do it. On either my hacked N4 or the stock ROM N5. You may as well be using a dial-up modem to get any data through either phone.
So, in the end, I don't have anything screwed up under "Network Settings". I'm stuck in "Edge" mode because Tmo is updating towers for LTE. It remains to be seen if I have to upgrade both and N4 and N5 to stay on T-Mobile however. The next few days will tell. I still think this is a bit of a ****-move on T-Mobile's part. Especially if I have to upgrade the N5. It's an expense I wasn't planning on. They could at least kick in some rebate to help out with the cost of new devices. No idea if it would save any money to switch carriers at this point.

My samsung galaxy alpha g850w wont 4g after a call

So i bought a second hand galaxy alpha phone. It was perfect in shape, no scratches or anything, meaning the phone was ell maintained.
The problem comes when im over LTE(4g) network. I try placing a call, it waits like 45 seconds and then it drops. i try calling for the second time and then after a couple seconds the signal drops to EDGE and start calling. after the call it stays a EDGE forever, unless I dial *#*#4636#*#* --->phone information--> set preferred network type: "LTE Only",....once signal shows LTE i can get it back to "LTE/CDMA/UMTS auto (PRL)" mode and keep surfing internet with 4g speeds.
Another related issue, if someone tries to call me when im over LTE, the phone doesn show any incoming call, but to the person calling, the call rings normally. So i dont get calls :S
I though it was a software related issue, so i rooted it and upgraded to andorid 7.1.2 lineage. but still the problem is the same. what shoud i do, i searched the internet and the answer is nowhere to be found nobody has this problem either

not receiving incoming calls...

just got the phone yesterday and updated it to the P beta. everything works amazingly well for a beta in my opinion, BUT i cant receive calls. outgoing calls, texts, web and apps are just fine.
spent almost 2 hours at tmobile flipping all the settings around and no luck. any ideas would be appreciated.

Same issue here bro...Incoming don't ring but I get voicemail notifications.... Really annoying, even if it is a DP.

Turns out the beta doesn't play well with the essential LTE. Switch to 3g and calls will come through. Hopefully it doesn't take long to find a work around for it

I believe the people having this issue have volte enabled...try and disable volte (it's broken anyway and more than likely why calls won't ring through) and see if that works

Got same issue... My experience was that I could solve the problem with reboot.
Issue came after playing on settings for mobile network.
Is meaning, when you do this you have to reboot afterwards otherwise you can't receive calls
Try it.

vergilbt said:
Got same issue... My experience was that I could solve the problem with reboot.
Issue came after playing on settings for mobile network.
Is meaning, when you do this you have to reboot afterwards otherwise you can't receive calls
Try it.
Click to expand...
Click to collapse
Tried rebooting multiple times while changing settings around. The only way I can get the calls to come through is by going without LTE completely.

knotjeff said:
Tried rebooting multiple times while changing settings around. The only way I can get the calls to come through is by going without LTE completely.
Click to expand...
Click to collapse
Settings/network settings/mobile network/advanced/enhanced LTE?

I had the same issue and to fix mine I just enabled Wifi Calling.
When on wifi I didn't get a call, just missed call notification. After enabling wifi calling, it comes through without issue.
I tested calling off wifi and on wifi and all calls come through good now.
This could be similar, so you guys might want to look at that also.
Good luck!

Heard from a few that this was solved by going into phone app settings -> calls -> calling accounts, then turning on "receive incoming calls". Seems it's disabled to save battery? Can't confirm as I just flashed to try it out and then went back to 8.1 because I like themes too much. Lol.

I'm on Sprint and was never able to make or receive calls regardless of Network settings in the easily accessible options menu.
The following fixed my issue. You can access this menu without downloading an app but I forget how so it's easier to just download the free app https://play.google.com/store/apps/details?id=com.xsquarestudio.forcelte
I had my network mode set to LTE/CDMA when first using this app, and somewhere in the middle I changed it to CDMA but I'm not sure how much that impacted the actual fix.
These were my steps. I'm not responsible for any damage this may cause to your device as I'm not sure if messing with these settings is foolproof or not.
First, opened previously linked app "Force LTE" then under "Set Preferred Network Type" I changed to CDMA only. Enabled/disabled airplane mode. This seemed to do nothing as LTE was still showing in statusbar.
I then chose CDMA auto (PRL), airplane mode on/off, didn't seem to do much either. LTE still showed in statusbar and couldn't make calls. Also "Voice Network Type" showed "Emergency Calls only" inside the app.
I then chose the 3 dot menu and chose "select radio band". I changed that to United States, without resolving problem. Then selected "Cellular 800" and this may have solved the problem, but I continued on and selected PCS, fiddled with some settings in Phones settings menu. Was finally able to receive calls and my signal indicator showed 3G. In app Voice Network Type was listed as 1xRtt. I decided to select radio band once more and chose Class 10.
Calls were still functioning fine. So I went into Main settings menu and changed mobile network from CDMA to LTE/CDMA. LTE kicked in and calls still work!
Again, these settings may only work for Sprint hence the PCS Network option, and I believe Sprint may utilize the 800mhz frequency. The app might show you different options depending on your carrier. I don't know.
Anyway, fully functioning! Woohoo!!

Forgetfull said:
Settings/network settings/mobile network/advanced/enhanced LTE?
Click to expand...
Click to collapse
I don't have anything in my settings that says "enhanced LTE" .
Tried using the 4g/LTE and the LTE only options. Neither would let calls through.

I have this problem using the Essential PH-1 with Android 9 Pie in South Korea on the KT network. It should be fully compatible, according to radio specifications, however it only works when I change the following setting:
Settings | Network & Internet | Mobile network | Advanced | Preferred network type | 3G
This is not ideal, since it makes the Internet slow, but at least I can make/receive voice calls. I submitted a support ticket to Essential requesting their official help (I'm well within warranty).

I had the same issue when I use my Att prepaid plan. The problem is caused by wrong network type, you can send text and browse internet, because they use the different channel. My PH-1 wrongly recognized the sim as CDMA/LTE mode, just switch it to 4G/LTE, it will be work. Go to Settings, then search "wi-fi calling", point "advanced" then you can see an opinion "Preferred network type" if you are ATT or T-mobile user, and your preferred network type is "LTE/CDMA“ then your phone cannot make call. Switch it to "4G/LTE", you phone will be work. BTW, Verzion uses CDMA, so if you are Verzion user, CDMA/LTE will work for you phone.

Rakuten Mobile (AU) in Japan

Rakuten Mobile (partner: AU mobile) in Japan is an MVNO that has a new UN-LIMIT plan.
There are many phones incompatible with their network (and partner network) and I'd like to understand why.
For example the Oneplus 5 supports all their+partner frequencies but it still can't grab the network (2G/3G and 4G).
There is a trick using a hidden setting in Android which is "LTE only". In that case, we can connect to the Internet.
1. We can't receive calls and can't call if the 4G isn't available because it happens via their "Rakuten Link" app (kinda VOIP).
2. The quality is awful, I receive a new complain of "echo" in the voice at each call.
Could you help me to understand what's the technological reason behind that?
If it isn't the frequencies, what can it be? I've searched everywhere, they never say the reason behind that incompatibility.
Thanks!

Dunno if you're still watching this thread but here's been my experience with Rakuten Mobile:
I have a rooted OP5T. Didn't work out of the box even after putting in the APN settings.
Did some digging around on Japanese blogs and enabling VoLTE does get me connected to the network. You can make calls over the network or use their Link app to use wifi/data instead. Both worked fine in the limited testing I've done. Data was also fine and pretty quick. This worked well for at least a few months.
However, some months later, the fixes and patches I have applied to get VoLTE enabled on my phone doesn't seem to stick or something is resetting it. If I stay home, my connection will stay on indefinitely, however if I go outside, after a few minutes my signal will drop and stay off until I reflash the fixes, or now it seems to reconnect if I reboot the phone. I am starting to think switching cell towers might be doing something? I have more testing to do.