discription of problem
I've got a problem with my phone, Samsung GS3 Gt-i9300, in the top notification bar, it says I have service, and it also says that when I slide the notification centre down.
Everytime I try to call someone, or text or use cellular data, it doesnt work, when i try to call someone it gets stuck at "Dialing" and whenever i try to text it gives me an error saying that the message was not sent. my cellular data just doesnt work, like it's not enabled at all.
furthermore, I cant recieve any calls or texts when my phone does this, which is a real pain in the neck, considering I cant use the device what it was intended for.
my current solution is to restart whenever I need to use my phone like a phone, and then it works for about a good 10 minutes (sometimes it works for longer, like an hour or two, and sometimes it only works for a minute) and then goes back to this stage.
background info
My phone is a Belgian or French model, and I live in the netherlands (shouldnt be a problem, since its internationally unlocked).
it shipped with the firmware version 4.0.X
currently its running on 4.1.2
what I've tried so far
when I first got it, it had 4.0.X on it (X= a number i forgot, I think its 1 though), so I tried flashing a leaked version of jellybean on it (4.1), later i updated it to 4.1.2 and the problem still wasnt solved. I had also rooted my phone at this point.
and recently I unrooted my phone and went to a normal 4.1.2 version, and the problem is still there.
I have also had numerous calls with my provider (T-mobile) and the problem is not on their side either.
I have also tried other sim cards, and the same problem occurs on those as well.
And lastly, I have cleaned the sim card slot numerous times, and it didnt help whatsoever.
I have heard of people patching the antenna software...? not sure if this makes sense...
what can I do?
Please tell me if you need more information...