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Help Not Registered on network problem

Hi I have a Samsung Galaxy S3 and my screen was damaged, after about 10 weeks of it being broken I now have a new screen and can use the phone again...or so I thought!

I will connect to wifi but when I inserted my sim it is coming up with "Not Registered on Network" I have played around with settings and even checked if my IMEI number is blocked but it doesn't seem to be. It is the same sim card I used before it was broken and when I put that sim card back into my HTC phone it is working fine. I tried my husbands sim card and it is giving the same error message.

I am on the 3 network. I can have full bars on my signal but the mobile data doesn't work. I was so happy to get my phone back and now its unusable!

Any help would be appreciated, Thanks.

MJ
 

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