My SIM card is not working after LG G4 in water for a few seconds. I immediately got it out of the water, and placed the phone into rice. Now the phone is fine, except for the SIM card. It's either giving me a no SIM card message or no service.
Mary, The SIM card is quite resilient to water. I think the problem was due to bad contacts inside the phone. I would try to test the SIM in another phone and see if the SIM works there first. If it doesn't work, then it is time to change SIM.