Service problems with my iPhone 3GS?

I recently bought an iPhone 3GS off kijiji, I had one before bit dropped it in water yesterday so I thought I would get another one. I'm pretty sure my SIM card is all good but I could be wrong. What do I do? Does a SIM card get ruined from being dropped in water?

It can get ruined. It should be completely dry before you put it in a new phone. If you can't get service you should try a new SIM card which can be provided by your carrier.

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