Why is my service on my iPhone not working but my Wi-Fi is?

I dropped my iPhone 4s in the pool and kept it in rice for a few days and now everything is working again except it can't find service so i can't call or text anyone without an iPhone. All it says is "searching…"

May have damaged the cell radios? Or you may just not have any signal. If everywhere you go it says there's no signal the water probably damaged something. You could try resetting it. If not then you'll probably have to get a new one/replacement

Maybe there isn't any signal?

Take it to the carrier & see if they could help