Why doesn't my iPhone 3GS recognize SIM cards?
I received an iPhone 3Gs locked. I unlocked it to find it doesn't recognize any SIM cards, so I am unable to get cellular service from any provider in my area. I've got three options in my area. LongLines Wireless, iWireless, and the dreaded AT&T. I have SIM cards from LongLines and iWireless. Here's the kicker. I also have an original iPhone that I'm currently using. Both SIM cards work in the original iPhone. I've done the standard restart/hard reset/reset network settings/restor
This has to be a problem with the SIM card slot, which is soldered down to the logic board. It's possible that it's a mechanical problem -- you might be able to open it up and discover that the card-detect switch is failing to detect SIM card insertion. Otherwise, you're going to have to replace the logic board.
Hello shai I dont exactly know the technical reason of why your iphone doesn't show signals after being water damaged.the good thing is that the phone shows signals some times now there might be some problem with the sim tray slot if you check the sim slot internals there is a gold pin at the end of the slot which is pressed by the sim tray and to force the hardware to start searching for a sim card try pressing gently on the head of the sim tray and keep pressing until the phone shows signs of signal since the sim tray is small take a small rubberized pin and force the sim tray at the middle ( all the force is for the golden pin push ) if that doesn't work then try sending it to a repair shop. Since the phone is water damaged
This is merely a theoratical suggestion if it works thumbs up for you I don't take any responsibility of the damaged caused to your phone by following this suggestion
Good luck :)