No Sim Card installed error in iPhone 4, how to fix
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If you iPhone 4 shows “no Sim card installed” error, there are three easy fixes:
- The easiest is to to go settings-Airplance Mode, turn on the Airplane Mode and then turn it off. Usually, the Sim card should work.
- If this does not work, next is to power off the iPhone 4 and turn it on. Most of the time, the Sim card error will disappear.
- If both 1 and 2 do not work, then, take off the Sim card, and clean it using a dry cloth and put back in. The iPhone 4 should work at this time, if not, take it to Apple store to fix.

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