[Completed] No connection to mobile networks :( - XDA Assist

hy guys a have a very big problem with my sgs3 (I9300) running official android jelly bean 4.3 international model, the problem is i'm not able to make a connection to mobile networks but wifi works very well, every time i try to make a phone call it shows a message "not registred on network" and i cannot accept phone calls from friends or family and i can't benifit from 3G networks.
this problem appears evt i flash a custom rom last time i take it to the person who selt me the phone and he sais that the problem cannot be fixed just with the "octoplus box" and it costs 10 dollars to fix it , is there any solution i'm waiting your answer
Thank you.

Sounds like it's a bad imei, need a carrier to fix it or possibly the box mentioned.

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[Q] samsung galaxy ace gts5830i - mobile network not available

Hi
I found the said phone in a field !!! at a music festival....
I unblocked the phone in shop so it would take my Vodafone sim..
It worked for 2 days and now i cant make or receive calls, texting etc
I have tried to search for a network provider but when its finished trying to register to Vodafone etc it says sim card doesnt allow connection to the network
i have tried going into factory settings to no avail....
have tried galaxy toolbox but straight away as i click onto it says 'failed to acquire ROOT access!'
very forceful hey !!! haha
am running out of ideas and am not a tech guy although i do want to learn more now.
Do u think the person who left the field has done something via their network provider that has done something to the phone
I am in England..... thank you for your time

[Q] Hero H9500 on O2 - no 3G connection

Hi, I hope somebody can help with this.
I have just received my new Hero H9500 Android phone. I am on O2 in the UK. I can connect to their network for calls & texts - I've even been able to make a video call. Internet is only achievable via WIFI. If I switch WIFI off and enable 3G, the phone just doesn't connect. I have tried downloading some apps to manage the 3G on/off, but this has made no difference. Having just got off the phone to O2, and them telling me that because it is not a phone that they sell they cannot help me, I'm now feeling a little hacked off!
The ROM is the stock ROM supplied, which I was intending to leave on, I'd rather not switch to the Zopo p900 ROM unless it is really necessary.
So if anybody has any useful advise, I'm all ears.
Thanks in advance!
****** I have resolved this problem...apologies if I wasted anybodies time! I manually changed the APN settings that O2 had automatically sent me when my SIM first registered on theor network and with a switch off and on of 3G it suddenly connected!

Not Connection to 2G/GSM Network

Hi there,
yesterday i received my new samsung relay. The Android version was 4.0 so the simlock was pretty easy. After the sim unlock i do the ota update to jelly bean.
At my home i receive 3g. Mobile works, as well as in and outgoing calls.
In my workplace i only have 2g and nothing works. No mobile data or calls. The phone shows some signal strengh (2-3 colums). but when i call the mobile phone, i get "partner not avaiable"
Till now, i havn't found a solution for this problem.
My actual baseband is T699UVBMC5
Could somebody help ?
best regards from germany
Flo
Big Facepalm for me
There is a known disturbance in my area.
so i must be patient......
Please close thread. 2G Connection works fine, after providers fixed its stations

Mobile Network Not Available

Hi folks,
This is my first post on here. I'm having a problem with my phone which I think is quite unique and I hope someone on here can help me fix it before I buy a new device.
I have a galaxy nexus (maguro) running cyaogenmod.
Previously I was running CM11 (cm-11-20141115-SNAPSHOT-M12-maguro) from the CM website and updated it to CM12.1 cm-12.1-20160719-SNAPSHOT-YOG7DAO8DL-maguro) a few weeks ago.
When I rebooted my phone it was running very slow (and getting very warm) so I did a factory reset and re-installed CM12.1.
It started working ok but I noticed that my phone was displaying 'emergency calls only' even though the network reception in the status bar was full, displaying 'H' (3g) and allowing me to connect to the internet using 3G.
Whenever I make a call it states 'Mobile network not available' and I cannot send text messages.
I tried phoning O2 and they gave me a new sim but the problem was still happening. I then tried putting my girlfriend's EE sim into the phone and I could make calls/send messages. I also went to France on holiday and could use my phone to phone/text using my O2 sim abroad. Whenever I put my O2 sim into another phone I can make calls and text.
So basically it is only when my O2 sim is specifically in the Galaxy Nexus that I cannot make calls/send texts but can still use 3g.
Oh yeah when I go to Settings>Mobile Network Settings>Network Operators the following available networks are shown:
O2-UK
T-Mobile UK
3 UK
vodafone UK
Orange
When I select O2-UK is states 'cannot connect at this time. Please try again later'
I've tried re-installing the older version of CM11 and today I tried wiping the entire phone (internal sd card etc) and it is still happening. Can anyone help? Is there something else I can wipe, or setting I can change?
Thanks in advance

I've get Signal but Emergency calls Only

Hello, so recently I bought a second samsung galaxy s7 (G930FD made in indonesia) I'm livin indonesia too. So, I have some problems. When i got the phone it had android 6.0. Everything worked fine, the sim, ussd codes, 3G internet. But status Phone is Custom, i can't upgrade via OTA and i trying upgrade via Odin
After that, i`ve upgraded to android 7.0 via Odin. I downloaded an official android for verizon s7 number PDA G930FXXS2DRAB, Now, with android 7.0, I've signal and strength but emergency call only, i can`t call any USSD codes (for example *200# that is the code for checking my sim balance). It just shows that it calls the ussd code and then says that the number is incorrect. Also, i can`t connect to the internet. I tried to find the Acces Point Names, but they are nowhere (like this function was deleted).
Also, in my settings app, i have 2 unknown options. T roaming and Service provider Giga LTE, KT twophone service and whenether i enter them, my settings app just crashes and it wants to restart it.
Please help me!
Have you tried connecting using 2G only if you can get to a place that sets the network? I had similar on my S4 and if I used dialer codes to force 2G it would connect, allow calls and allow EDGE data. I never resolved the issue but the best I could find out was the EFS/modem was corrupted or incorrect so it can't communicate on 4g.
This also happened after a 6.0.1 to 7.1.2 upgrade though I'm not sure it's the same as I don't think the S4 supported Nougat officially. I gave up when I went to a local phone shop who were apparently an authorised Samsung service centre but didn't have the tools to repair/replace the EFS (or anything else so it seemed).
sixtyfootmalcolm said:
Have you tried connecting using 2G only if you can get to a place that sets the network? I had similar on my S4 and if I used dialer codes to force 2G it would connect, allow calls and allow EDGE data. I never resolved the issue but the best I could find out was the EFS/modem was corrupted or incorrect so it can't communicate on 4g.
This also happened after a 6.0.1 to 7.1.2 upgrade though I'm not sure it's the same as I don't think the S4 supported Nougat officially. I gave up when I went to a local phone shop who were apparently an authorised Samsung service centre but didn't have the tools to repair/replace the EFS (or anything else so it seemed).
Click to expand...
Click to collapse
Now my phone is already in service centre, I am advised to wait, technician sams looking samsung galaxy S7 is usualto copy data then put into my handphone
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