Internet on my iphone keeps disconnecting?

Okay so i have the iphone 3g (yes, i know it's old, please don't remind me) and everytime i use it i clearly have internet. The only problem is after about a minute my internet shuts down, this happens every single time. I can't use the phone more than a minute without my internet shutting down, most times it just says "no service" on the top… Which is crazy… Any help will be appreciated.

It sounds like its time to get the iphone 5 and throw that in the recycle bin

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