Galaxy s3 gt-i9300 not registered on network problem

i've done everything with kies but now the same problem en i've gotten an other serial number what can i do now i can use my phone for olmost 3 weeks no calls and no sms nothing only wifi????please help me its killing me
 
Thank u very much sir!!
I've got the same problem before and now with your method, I got back my network again..

Thanks again GENIUS!!!!!!
 
is this a custom rom , you can use cwm or twrp to install it.
if its a stock rom you can you odin as i mentioned above .
if you had a 4.3 version before repairing, then you could not downgrade. if its a custom rom then it is ok

I'm from Uganda my s3 has the same problem always saying not registered on network. Can I change its rom from 4.3 to 4.1 without using a computer I don't have one
 

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