If you need to insert or remove a sim card from your iphone 3gs you might find the instructions below useful. Before performing this procedure its ideal to find out what network your phone is locked onto, as you may require an unlocking code.
1) Power off your smartphone.
2) Insert a pointed object into the hole at the top of the sim card tray. The object that can be used can be a paper clip of some sort.
3) Push the object down, the sim card tray will pop out.
4) Insert a network sim card of your choice and re insert back into your iphone 3gs.
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