Dropped iPhone4 in toilet but still kind of works a little?

Yesterday I managed to drop my iPhone 4s in the toilet, when I had noticed it was still working I did stand there in shock for a while. I think the phone was in there for about a minute before I managed to get it out. As soon as I got it out I switched the phone off shook it up and wrapped it in a towel to put on a warm radiator. I left the phone on the radiator for about 2 hours, I then noticed that the condensation was starting to go so I jus used an hair dryer to dry it until I saw all the condensation was gone. After doing that I placed my phone in a dry warm cabinet, still switched off just to make sure it was drying properly. The phone was left there overnight, this morning I attempted to switch my phone in and to my surprise it all cne in and worked perfectly. But then after a while my phone started to switch itself off, it would turn straight back in but every 5muns now it goes off 4 a second. I have also noticed my phone has stopped reading my sim card, I can still use the Internet and that as normal as I am still receiving wifi the only thing I can't do is text and call people. Do u think there is a chance if I keep drying the phone with an hardryer and re taking the sim out and putting it back in that edventually the phone will stay on and read my sim again.?