Help Galaxy S3 Emergency Calls Only

[rapzeh76]

Phone worked fine two days ago, yesterday I went out in the rain and my pants got soaked and my phone accidently called someone whilst I was walking home which they told me afterwards. As soon as I got home I took my phone out of my pocket and it looked completely fine. I couldn't turn the screen on at the time but that is due to a bug with calls in Cyanogenmod, so I took the battery out and re-booted just fine. But, as soon as I got on to the phone, I got stuck in Emergency Calls Only, and I still am. I simply can't call anyone or text anyone, having been able to the previous day. Is this water damage to my phone or my sim card? Please help, I was contacted only today by someone willing to buy my phone for