My iPhone 3GS is messing up?

I have an IPhone 3GS and it won't let me update it at all I have tried to have my Friends help to they can't also… My phone won't let me get on my Internet but when it does It knocks me out back to my main page on my phone… I can't down load any apps I can't get on any apps all I can really do is call and txt and most the time that is messed up but not all the time… DOES THIS MEAN MY IPHONE Is CRASHING? If so is it doing it slowly and if that is so they only way I can get a new on is if it completely is crashed how do I do that?

What!

Restore your iphone through itunes. Also, if you need a new one, plug it into itunes and try to get it to back up to your computer. After it does, if it is AT&T, remove the sim card an place it into your new phone. You may need help because the iphone 4 and up use micro sims which will require transfer of the sim information too a new one or the larger sim from your old iphone cut to fit into your new one. I suggest having this done at a store like best buy because any phone retailer hates the iphone and will offer little sympathy and or help of restoring it because they earn no revenue off of the initial purchase of the phone.

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