Apps not working on Jailbroken Iphone 3g?

I have an Iphone 3G that i jailbroke 6 months ago and using it with T-mobile. The applications suddenly stopped working and are not responding. Also, the safari browser shuts down within a minute. I was trying to reset it but wasn't able to do so.

Please tell me what needs to be done to fix this problem.

Tmobile sign out of old network because they will have make new network for 4g 3g on iphone 4 and 5…
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