iPhone 4S Doesn't Recognise any SIM card

iPhone 4S Doesn't Recognise any SIM card I have a 4S and its a strange issue, it doesn't recognise any SIM card 99% of the time. By this i mean tonight i have removed the board and using compressed air and pure alcohol cleaning solution to try and clean the SIM area and it worked!, right up until i removed the SIM card to try another. Before i did this i had nothing recognised.
Asked by: Guest \| Views: 194

Total answers/comments: 5

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Guest [Entry]

"SOLVING THIS PROBLEM:

Go to Settings => General Settings => Reset => Reset Network Settings

It is a known issue when you unplug the battery."

Guest [Entry]

We managed to fix it by turning on airplane mode, re-setting the time manually and then turning the airplane mode off again. This was related to unplugging the battery...

Guest [Entry]

Try a spacer on top of the sim to push it down on to the contacts. Some times (If you remove and install a lot) the contacts can not reach up to touch the Sim.

Guest [Entry]

Set time manually then do network reset! It works

Guest [Entry]

It's probably an issue with the logic board, so you need to replace it, unless you want to try replacing the sim reader yourself, which is very hard.