I have been using Nexus 7 (2013) - Cellular for roughly around a year. I use 3G/4G/WiFi for internet connectivity on the tablet.
Since the past one week I have not been able to use the tablet with any 3G/2G sim cards. The tablet only recognises SIMs of a particular provider (lets say "Y" in my case) and that too only for 4G connectivity. This was not the case before and I was able to use SIMs of different providers and on different network modes.
If I insert a SIM other than Y's, the signal strength in about tablet -> sim status is shown as zero.
Also, if I insert a sim other than the "Y" service provider's and search for networks manually the tablet only shows "Y" service providers name and does not even show the actual sim providers/operator's name.
I have tried going to settings and changing the network modes, have tried *#*#4636#*#* settings - these have not worked for me.
Any help on the issue would be appreciated.
Thankyou.
UPDATE: It turns out that I have messed my tablets GSM/UMTS Band modes in the Testing Settings.
I have been able to restore EDGE connectivity on my tablet. However 3G still does not work. I am guessing it's because of the band mode options available to me on CM14.
Tried full reset but it didn't work.
Any help on how to restore my tablet's band mode and get back full 2G/3G/4G connectivity would be really great.
Related
Hi Guys.
So received the phone on Thursday, Friday I did a sim swap from my normal sized sim to a micro sim. I waited the whole day but the phone didn't have any network access.
Today when I woke up I I switched the phone on hoping that everything will be fine, thinking the simswap just hasn't gone through yet, still no network access. I took out the swim from the phone and switched with my ipad, the sim was working in the ipad, and the ipads sim also didnt give the phone network access.
In the top right corner it shows full bars in grey, cant make emergency calls or anyhting.
In the about section of the phone, I have ALL the details present, baseband version is there, kernel version is there.
In Status section, network is unkown, signal strenght is -83 dbm 15 asu, network type unkown, service state is out of service, and the rest is also present.
I thought the phone didn't properly register to a network, so went into settings - wireless networks - more settings - mobile networks, but it gives me a insert sim card message.
The phone is reading the simcard fine because it asked for the PIN when switching on.
When trying to make a call I get, it says "Not registered on network"..
So what am I to do? Vodacom can only pickup the phone and exchange it on Tuesday, so was hoping that this might just be a software issue that can be resolved by a flash.
I have tried resetting / hard resetting the phone numerous times.
Its the Note 2 N7105 LTE Version
Any help would be highly appreciated.
Wrong forum.
Hello there, I'm in need of your help again.
My SGH-M919 has a problem, it cannot connect to 3G/LTE (Not even EDGE). My carrier uses the 850 mHz band for GSM and 1900 mHz for UMTS, so the phone should be able to use them. The thing is, it doesn't. It only connects to GPRS and the signal is very erratic and weak (Usually 2-3 bars). Sometimes I get SMSs from my carrier saying that I missed like 5 calls when my phone never rang once. I live in a zone with good 3G coverage, so it's not the signal.
I'm currently rooted on Android 4.4.4 (NH7). I already tried selecting "1900 WCDMA" in the *#2263# service menu but that only causes the phone to lose all the signal (And it's a problem to change it back, without signal the service menu doesn't work and I cannot change the Network Mode in Settings).
I've tried to select "WCDMA only" mode before, but my signal just goes to zero (The circle with the slash) before changing back to "LTE/WCDMA/GSM (Auto connect)" automatically.
I also cannot use the Network Operators option. Using "Search now" makes it search for a few seconds before showing the message "Error while searching for networks". The "Select automatically" one shows the message "Unable to connect. Try later" and then connects back to my carrier (Movistar)
My APNs are configured (They did it themselves when I inserted the SIM, but I've configured them manually before). The SIM card works, I tried it in another phone and it got 3G immediately, I also tried another SIM card on the GS4, but the result was the same. Someone told me to upgrade to the latest firmware (NK2) while someone else told me to flash the MDL modem. (Is that even possible? I read something about KNOX blocking all downgrades after 4.3).
Since I couldn't find any direct solution to the problem, I'm recurring to you.
Thanks.
P.S: I didn't change the LTE Band Preference option in the Service Menu because the last time someone messed with it, my IMEI/Baseband went completely nuts, I thought the EFS got corrupted, but they magically appeared everytime I enabled the Airplane Mode (So I was able to select Automatic in the ServiceMenu and they got fixed). Also, I don't live in a LTE area although once during a very strong thunderstorm, I got 4G for a few minutes before going back to G).
*bump*
Any ideas?
Did you put a check mark in data roaming?
Shortbus-Driver said:
Did you put a check mark in data roaming?
Click to expand...
Click to collapse
I've tried with and without it, it doesn't make a difference anyway.
Does it show you have an ìmei # other than all zeros?
Don't post it just a yes or no.
Shortbus-Driver said:
Does it show you have an ìmei # other than all zeros?
Don't post it just a yes or no.
Click to expand...
Click to collapse
My IMEI is fine, the phone connects to the carrier network but it stays on GPRS (and the signal is always dropping)
Update to full NK2 firmware and see if that will fix it
serio22 said:
Update to full NK2 firmware and see if that will fix it
Click to expand...
Click to collapse
I'll try that later. Will I have to re-root and re-install TWRP after flashing NK2?
I have a similar problem with my M919 on the Tmobile network. Using the *#2263# menu I can not get mine to work on WCDMA (4G) either. I can chose GSM /LTE only and my phone works normally but no 4G signal. If I chose WCDMA I get no signal. I can see it trying to connect and immediately dropping the signal. If I choose any option with WCDMA included it has erratic signal and will lose the signal most of the time when I try to make a call. So basically I have the choices of GSM only or GSM/LTE only. Before I discovered the secret menu I was stuck with GSM only in the phone's settings. This has been going on for months. Tmobile changed my SIM card and it didn't help. I've rooted and unrooted my phone (using autoroot) and even tried different modems (even worse signals) and now am back to stock rooted NK2 firmware and modem. I have given up and decided to get another phone (not an S4). My wife's S3 gets great 4G signals in the same location by the way. I wonder if anyone knows why our phones can't use 4G. I am beginning to think it's a hardware problem but I'm way out of warranty on mine.
Hi guys,
In my Nokia X, the mobile data uses EDGE(2G) instead of UMTS(3G) which results in very low speeds around 170kbps!
Using the USSD code *#*#4636#*#* I can see that the Network type is shown to be EDGE, while the preferred network is set to "WCDMA preferred". If I try "WCDMA only" the SIM card stops working and I can't make any call - except emergency calls... I've tried different network types while swithing off and on the phone but without success.
I've put the same SIM card in another phone, which is HTC Desire C and I can get the mobile data working perfectly in 3G speed (up to 6.5Mbps in my case). Phone Info shows Network type to be UMTS as it should be.
When I put the SIM card back in Nokia X, I get the Network Type EDGE.
I have the same exact APN settings in both phones. And the phones are in the same room so the signal strength is the same for both. My Nokia X is rooted but no custom ROMs installed except Google play.
Can you please suggest any solution for this problem. :crying:
Nokia X shows only E (edge) not H and 3G.
I've tried *#*#4636#*#* phone information and set WCDMA prefered but still have only E.
Does Nokia X really support 3G ? I'm getting suspicious now.
Sorry, I did not find the correct forum for a Samsung a3 2015.
I have an a3 2015 that's not finding any network, I suspect the simcard en card reader is functioning because when I start the phone it asks me for my pincode and I'm able the login to the phone.
It has a valid imei, but when i try to call it says "unable the register on network"
Has anybody seen this problem before and knows how to fix it ?
That could be caused by, including but not limited to: Low signal strength (ignore signal bars, phones could select other MNOs and measure that), bands in coverage are not supported by the phone, tower or its backhaul is down for maintenance (or failure), IMEI/SIM (ask your mobile network operator anyway), circuit switching is not supported or out of coverage of the mobile network operator, the CSC in your ROM is not applied correctly for (packet switched) VoLTE (if the mobile network operator supports it on your device), antenna failure, the wrong mobile network operator is manually selected in the network settings, too much interference from neighbour cells on the same channel, bad reselection/handover, the signal has been 'echoed' too much, too far away from the tower for the timing advance, too far away from the tower for the RACH parameters.
Probably not...
Device is locked to LTE only. Or locked in some other way.
1. try to put your simcard on different phone. is it work? if yes, so your sim card reader is broken
2. have u reset your device to its default state? if yes and still the same, u have to reflash the whole rom through ODIN. if u haven't try it, do it now.
3. use another simcard on your phone, see the signal bar, is it there? if no signal, then the answer could be on the number 1 / 2.
4. what u did until u lost your signal?
I've tried the simcard in another phone, it's working.
Can the simcard reader be broken, even if it asks for a sim pincode ?
The phone was working until they pushed some updates, i've tried a factory reset but without success.
I've been reading on forums the problem could be a QCN file or a cert file ?
Is this also replaced when reflash the phone ? ( new a this, so I don't want to brick the phone.)
Where can I find the correct firmware ? Is it country related or just a300fu is fine ?
The thing i find weird about it is the phone is not showing no signal icon without the simcard insert (first icon on the link)
But shows a gray singal icon (like the second icon on the link but completely gray, without the bars).
http://newsandguides.com/samsung-galaxy-s3-android-notification-bar-icon-guide/)
update: when I turn airplane mode on and off, the signal icon is showing signal bars without a sim card insert.
Nobody that can guide me to the correct firmware ?
peter43 said:
Nobody that can guide me to the correct firmware ?
Click to expand...
Click to collapse
You know the phone's model. For the CSC (country),
Use the one in your phone, there are apps to read CSC or use "getprop ro.csc.sales_code" in a terminal emulator.
Use the one of your current location/mobile network operator, the displayed 'location the CSC belongs to' on CSCs might not be accurate. It might not apply correctly.
Use a different one, but some apps might be customized differently, there are indeed some cellular configurations but it's mostly higher features, not basic functionality (though there are some). It might not apply correctly.
For the version, try an upgrade or the same version. Open the stock recovery to fully apply the CSC. For downgrades, the number in the middle of the firmware version can't be reduced. If a downgrade causes the loss of cellular, wipe data or return to the previous firmware.
In most cases I highly do not recommend attempting to restore the EFS, flashing PIT, or downgrading to Lollipop on A 2015.
The signal bars being 'blank' after an insert might be because the tower is simply distant. Calls could work on another phone if the bands (or selected RAT on the phone - 2G/3G/4G) of a nearby tower or VoLTE/VoWiFi is supported. Appears without a SIM, or could be suddenly raised with the SIM, might be because the phone has selected other mobile network operators (not related to your SIM), for measurement and limited use... you can view the transition here *#0011#, there are a few others like this but it should be enough, it is MCC(country)MNC(operator), also called PLMN ID. For the signal strength, while your mobile network operator is selected, RSSI is the signal strength of that channel, RSCP and RSRP is approximately the signal strength of the cell not canceled out by interference, ecio,ecno,rsrq,sinr,rxqual are signal quality.
Maybe the spectrum of the previously good tower has been refarmed (the frequencies previously used on 2G is now on 4G for example), or anything above, or an update somehow broke band support.
Before modifying firmware, try moving around, to connect to other cell towers of the mobile network operator of the SIM, the current band should be in 0011, check which bands your MNO uses, the list of bands the phone supports are on the internet. If for some reason the plmn id isn't in 0011 there are apps to display it.
I found out that *#0011# gives you access to the service menu.
q0000 should give access to the network modes, but this is not working, is there an other code a should use to get access to the network modes menu ?
peter43 said:
I found out that *#0011# gives you access to the service menu.
q0000 should give access to the network modes, but this is not working, is there an other code a should use to get access to the network modes menu ?
Click to expand...
Click to collapse
q0000 probably does not apply to Android Lollipop and above. On lollipop and above, it's *#2263# for band selection, marshmallow, *#2683662# (and others), for channel selection and all that, even fewer on Nougat, even fewer on Oreo. Root might be required, but those codes are available in some CSCs (mostly US carrier ones) for some devices without root. Compare *_keystrings.dat in /system/etc.
For the other kind of network mode, also known as rat (radio access technology), 2g/3g/4g, apps might be able to open 4636 without root, there's the full selection.
Tried both codes but without result ...
The phone is running Android 6.01
Not registered on Network
Hi, I have the same problem with my samsung galaxy a3 2015. I tried several ways to fix it such as flashing stockrom,factory reset And even then tried a custom roms but still have this issue. This issue can be only Fixed by replacing network I.C to a New one.
Its only the problem of network i.c .
I'm on EE UK but the preferred network type setting doesn't appear to be present in SIM options?
It appears that some providers suck hard and don't want to allow you to switch networks. That's not a phone thing-y, it's a provider thing-y. Which means that your phone will of course still change networks, but only if the "higher" one is not available, ergo your phone will only connect to 4G, if 5G is not available - if the 5G connection is bad, that will probably cause problems for you, because your phone will probably not want to connect to 4G automatically.
I can easily switch preferred network types
Settings -> Network & Speed -> SIMs -> (scroll down, between 4G Calling & Carrier settings version) -> Preferred network type (5G, 4G, 3G, 2G).
It that's not available, your network carrier sucks. No more to say here.
I'd suggest you either switch providers, or contact your provider to see if they are willing to change this. It's definitely on their end, cuz people like me can change the settings easily.
cd993 said:
I'm on EE UK but the preferred network type setting doesn't appear to be present in SIM options?
Click to expand...
Click to collapse
You may be able to change preferred network type with *#*#4636#*#* dialer code.
cd993 said:
I'm on EE UK but the preferred network type setting doesn't appear to be present in SIM options?
Click to expand...
Click to collapse
EE (& BT Mobile) hide the menu.
Morgrain said:
It appears that some providers suck hard and don't want to allow you to switch networks. That's not a phone thing-y, it's a provider thing-y. Which means that your phone will of course still change networks, but only if the "higher" one is not available, ergo your phone will only connect to 4G, if 5G is not available - if the 5G connection is bad, that will probably cause problems for you, because your phone will probably not want to connect to 4G automatically.
I can easily switch preferred network types
Settings -> Network & Speed -> SIMs -> (scroll down, between 4G Calling & Carrier settings version) -> Preferred network type (5G, 4G, 3G, 2G).
It that's not available, your network carrier sucks. No more to say here.
I'd suggest you either switch providers, or contact your provider to see if they are willing to change this. It's definitely on their end, cuz people like me can change the settings easily.
Click to expand...
Click to collapse
Or you could just make sure Adaptive Connectivity is enabled and not worry about it.
You would have to drag me away from EE (BT Mobile) screaming and kicking given the coverage and speeds they have, to say they suck over one menu option missing is absolutely laughable.
cd993 said:
I'm on EE UK but the preferred network type setting doesn't appear to be present in SIM options?
Click to expand...
Click to collapse
When the Note 20 first came out a lot of carriers wouldn't let you change network type but there's an app in the play store that was working on the notes.
Force 4G/5G Only - Apps on Google Play
Lock your phone to 4G/5G mode or VoLTE network
play.google.com
ggrant3876 said:
When the Note 20 first came out a lot of carriers wouldn't let you change network type but there's an app in the play store that was working on the notes.
Force 4G/5G Only - Apps on Google Play
Lock your phone to 4G/5G mode or VoLTE network
play.google.com
Click to expand...
Click to collapse
Crashes or alternately just disappeared for me when I click on the first option "4G LTE with only one SIM". Reported the crash. Thanks, though. Maybe they'll update it.
An alternative to the dialer code is to boot into safe mode, and the preferred network type setting will appear in: Settings -> Network & internet -> SIMs between Data warning & limit and Carrier settings version (at least it does on my Google Fi Pixel 6 Pro).