Nokia 6303 classic won't connect to phone internet D:?

Hi, I have a Nokia 6303 classic, I've had it for just over a year, and recently (last few days) it won't connect to mobile internet. I try to connect it and it just loads forever. I'm on Orange. None of my friends have same problem. Does anyone else have the problem, or know how to fix it?

~Also the phone's calculator has stopped working but I don't really care much for that~

Please help!
UPDATE! It's now saying 'Service Not Available'

D: ?
 
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