I have a network issue with my OnePlus 8T. Whenever I enter an area that doesn't have great signal, if my phone connects to 4G, I completely lose all signal and the phone will read "No Service" or "Emergency Calls Only". The best thing I can do is toggle Airplane mode or restart the phone to fix it. The issue does not occur if I set my phone to 2G/3G only. My phone will have signal absolutely everywhere, there isn't a spot that I know of that doesn't get reception. However, the moment I tap "Mobile Data", if the phone connects to 4G and the signal isn't 50% or better. My phone just loses all network on the spot and refuses to return unless I do the two things I listed above. I've been in contact with my service provider, tried swapping SIM slots and cards, reset my network, verified APN is properly setup. Just about everything by now. Does anybody know of a possible solution to this?
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First this only happens where I work in the basement where only certain providers (eg Verizon) have some signal in only part of the room. I did not get signal on AT&T or T-Mobile Pay as you Go down here.
I noticed especially after I flashed the new radio which gives me better service overall that I get phone signal down in the basement, but it is GPRS of Unknown Network and says emergency calls only. I get up to 3 bars. If I scan for available networks I get the name 31064.
Does anyone know what network that is or what is going on?
Anyone have any ideas? (I will take wild speculation as well)
i wouldn't be alarmed by it. I experience this at my office since I work in the basement...haha
It's possible your basement just won't read a signal like mine. install a window by your desk, maybe that'll help, but there shouldn't be anything wrong with your handset.
Sounds reasonable. I would agree with no problems with my handset. I do get better signal than my nokia e51, so maybe it's picking up a slight signal where the nokia could not.
From what I've noticed, my Nexus S acts this way whenever T-Mobile (my provider) does not have coverage wherever I am, but AT&T (not my provider) does. You can check this by going into "settings" -> "wireless & network settings" -> "mobile networks" -> "network operators" .....it will then search for & tell you what network has coverage where you are. Every time I've had bars & it says "emergency calls only" & I've checked the above, it's always been when I had coverage from AT&T but not T-Mobile.
Thus, it seems to me like an "enable roaming for emergency calls only" kinda thing.
Emergency calls only
ha ha....lol... i also have the same issue on my brand new i747M S3. im confused.
i try the all methods for resetting phone.
i noticed when im on long way, i dont know my handset is goning emergency calls only. but when im restsart phone its fine.
i do everything but not fixed it. firmware update, downgrade, rom change,and unroot. but not fixed, and also try factory reset the rom by falllowing the samsung secret code *#197328640# > UMTS>COMMON>NV REBUILD and restart and do again CDMA>COMMON>NEXTPAGE>REBUILD and restart., thhis is the code of full factory reset the rom and EFS. but not solve........
i change the hand set to international i9305 brandnew one. i used it 2 sady without issue.... day after morning when i wakeup, i see the massege,,,,emergency calls only,,im confused becouse this is a brandnew one...after i called the friend he also got the i9305. i asked about this issue. he said me he didnt face to this type of issue.. im confused he said me try sim change.. i do it... problem solved....:victory:
problem is the SIM card......i changed it to new one... and used i week no emergency calls issue... when im going to low signals areas.. its show no network and automaticallly change to the network....im very happy for fixing this problem.....:laugh::laugh::laugh:
I am currently in Italy using a Vodafone UK sim card, it's been working perfectly (apart from randomly dropping complete signal periodically) but now it's just completely died, as in it won't find a signal at all to connect to any network let alone data roaming. I have contacted Vodafone who said there's nothing wrong at their end and the worst thing is it was working perfectly till this evening. So now it sometimes says emergency calls only or just the ring with a line through it as it cannot find any signal at all. I have tried doing manual network operator selection and automatic but still nothing... Any ideas? It's a g9550 128/6gb
Update I now have 3g data but it says "no network connection" and I cannot send receive texts or phone calls, yet I have full data...
@nugget123
Consequences of buying a CN/HK variant....
They usually have network connectivity issues, not surprising. Try removing the SIM card, turning the phone off, wiping cache in recovery, insert the SIM card, and then reboot. Then manually go and search for a network in settings and force it to connect to Vodafone Italy, should work.
It's working now again, I didn't do anything lol it just started working on its own accord! I'm now in Switzerland and all is good. My life is empty without my phone
It always happens to me when abroad. I am on O2. I have to select network manually and pickup different to the one which auto connect shows emergency calls only. Looks like some cells allowing me to connect but won't pass through calls
Do you also have a usa/china variant?
No, o2 UK from Samsung
Hello XDA Community!
When my new phone (Huawei P9 Lite Mini) is on 3G/2G auto network mode, it consumes more battery than LTE/3G/2G auto mode even mobile data off.
I do not understand how this happens? For example, while 3G consumption at overnight is %10-15; LTE is only %2-3. This problem is the same in daytime too. Mobile data is off, unneccesary services/apps disabled, and no extra application installed while this happens. I tried all "wipe/factory reset/update firmware/factory reset/wipe/no app install" procedures, enabling all battery saving options, but it did not work. This is a problem for me when I'm in non-LTE areas.
This problem occurs the same result in different locations. There was no problem with my previous phone and I use same nano sim card.
I tried the following but it did not work:
- Wipe cache, factory reset, wipe cache,
- Wipe data/factory reset over recovery menu,
- Update latest firmware, wipe data etc. again.
How this happens and where am I doing wrong? Thank you for your help, best regards!
EDIT: PROBLEM SOLVED!
I changed my mobile carrier (provider) and the problem is gone. This is very interesting! I worked for hours and days to solve the problem, but this problem is neither caused by the phone nor by the software...
WCDMA (aka 3G with support for 2G/Edge) is in always-on mode on most phones, because that's how you receive and emit phone calls and, for most phones, SMS (in some more recent phones, LTE takes care of sending and receiving SMS/MMS), so if you're in an area where 3G/2G reception is poor, your phone has trouble locking on a cell with enough power to maintain contact, hence the battery drain.
4G/LTE only works for data, and voice if you have VoLTE (Voice over LTE) enabled, but works on a on-demand mode, even with cellular data constantly enabled. In other words, the 4G modem on your phone will memorize the latest position and IP address the nearest 4G tower/cell allocated it, and connect to it using the memorized settings when you need it to.
Not so with 3G, where DHCP doesn't exist, at least not the way it does in 4G: it uses PPP (Point-to-Point Protocol), where an ad-hoc IP address is attributed to each new connection, based on a pool of existing addresses allocated to the tower and its owner (carrier) by the authorities.
UglyStuff said:
WCDMA (aka 3G with support for 2G/Edge) is in always-on mode on most phones, because that's how you receive and emit phone calls and, for most phones, SMS (in some more recent phones, LTE takes care of sending and receiving SMS/MMS), so if you're in an area where 3G/2G reception is poor, your phone has trouble locking on a cell with enough power to maintain contact, hence the battery drain.
4G/LTE only works for data, and voice if you have VoLTE (Voice over LTE) enabled, but works on a on-demand mode, even with cellular data constantly enabled. In other words, the 4G modem on your phone will memorize the latest position and IP address the nearest 4G tower/cell allocated it, and connect to it using the memorized settings when you need it to.
Not so with 3G, where DHCP doesn't exist, at least not the way it does in 4G: it uses PPP (Point-to-Point Protocol), where an ad-hoc IP address is attributed to each new connection, based on a pool of existing addresses allocated to the tower and its owner (carrier) by the authorities.
Click to expand...
Click to collapse
Thank you for your reply!
When I googled about 3G vs. LTE battery consumption, everyone says that LTE will consume more batteries. That's make sense on first thought. So what I've been through is very interesting to me.
I think about is there a problem with my phone's 3G antenna. (footnote: I don't know about that 3g and LTE antennas are same or seperate?)
But I understand that you say this is normal, right?
Edit: I found a forum that this problem may be due to the operator (carrier). I'm still investigating...
3G and 4G operate on basically the same principle: receiving and sending "information" via radio waves.
The difference lies in the frequencies each standard uses, the way the data sent over them is modulated and demodulated, and how handsets make and maintain connection, so if you stay in the same location, and set your phone to 3G-only, then switch Airplane mode on then off, it'll take your phone longer to reconnect to the 3G cell/tower with the strongest signal (not necessarily the closest to you), because it'll have to go through the whole getting-acquainted process again, whereas in 4G, it'll go straight to the "Hey, how do you do? Long time, no see".
Now, if your phone antenna has a problem, you could be standing a few feet from the tower, in line of sight, and still get a crappy to non-existent signal. How many bars are showing on your screen is just an indication of how well your phone is receiving the signal from the tower; it doesn't mean that this signal is consistent and steady, hence the bars coming and going in real time.
If I were you, I'd download and install the Hidden Settings app from the Play Store, and run it; there, you go to RadioInfo, and you'll get a lot of information about how your phone modem actually works. It's a bit technical, but it would give you an indication.
I will try and looking for a new carrier. Thank you again. See you.
I changed my mobile carrier (provider) and the problem is gone. This is very interesting! I worked for hours and days to solve the problem, but this problem is neither caused by the phone nor by the software...
Hey all, thanks in advance for any advice offered.
For some reason my Galaxy S8+ has a greyed out GSM signal bar with an 'x' next to it. As far as I remember the only thing I did was put it to charge overnight. I've tried removing the SIM, still grey, inserting another carrier's SIM (known to be working), still grey, my original SIM also works fine in another phone. Everything else not related to cell service works fine (wifi, bluetooth etc.). I can see the IMEI number in settings as usual.
I've tried resetting the network settings, factory resetting the phone, I've even reloaded the ROM via Odin. No joy.
The phone is pretty much stock, except for the fact that I changed the carrier software from AT&T to Verizon in order to use a particular LTE band. Since I did that, the phone worked fine for several months.
I've only noticed two things odd thus far. After reloading the ROM and downloading a few updates, a game (Empire) appeared from nowhere installed in my app drawer. Also, the Airplane mode icon in the notification shade is light blue, similar to when it's transitioning from off to on. Airplane mode seems to work though, because I can toggle it, and the wifi reacts as such.
I can't search network operators manually (says: Error while searching for networks), changing the network mode does nothing, and none of the secret dialing codes work either. They all say "Mobile network not available". With a SIM inserted, my SIM status menu says, Network: unknown, Signal strength: -113dBm 0 asu, Service state: Radio off.
Sorry if I'm long-winded, but I'd appreciate any assistance at all. Thanks again for taking the time to read.
I had the same issue and I replaced the daughterboard and antennas
Hi,
As the title states, i didn't make any change to the phone but now i can't get data or phone calls even tho it shows i'm connected.
I've tried:
Resetting Network settings
Clearing cache on the dialer and a few sys apps
Clearing cache on the system level from recovery
Swapping the sim to another device proved that it's a problem on this device alone
Looking at the phone info menu from *#*#4636#*#* shows that i get LTE but then it drops to UTMS on voice and HSPA on data when i get a call and after it drops, any new call isn't being received and the phone doesn't go to LTE without resetting the radio signal
I also checked on another identical phone and it's the same only that one goes back to LTE after the call..
I've tried to switch the preferred network types but it either didn't help or it didn't work.
Wifi works fine and so does BT, data works fine sometimes and sometimes it doesn't, voice just doesn't work almost at all.
I'm still on Oxygen v9 and so are the other phone which work.
Any other ideas to try apart from reinstalling\updating?