Why does my iphone 3g say no service when its turned on?

Why does my iphone 3g say no service? I have tried
Restart
Turning on/off airplane mode
Reloading the sim
None of the above worked. Now my phone has been through alot. It has been slammed in the car door and been in the washing machine. It all works. Fine accept for my signal. It probably has something to do with all if the things that has happened to it before but i don't know help please.

Poor phone, the washing machine has proberly killed it the most, take sim card out and leave out, ask your network for a replacement (it will keep the same number) and try the new sim in it, if that fails time for a new phone or look at having it repaired but to be honest it will most likely develop a new problem soon after having it repaired.

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