Why can I not use any sim card in my iPhone even though it is unlocked?

I got an iPhone from a friend who says that the phone is unlocked, but every sim card I try in it seems not to work, it keeps on coming up with the same message that "There's no SIM card installed in the iPhone you are attempting to activate. Please disconnect and insert a SIM card in the iPhone." when have clearly put one in.

What can I do?

The SIM card reader may be defective. Try turning the phone off and on with the SIM card inside

Or try slapping the chip in hard when inserting it. Like hit it hard

You must make sure that the iPhone you are using is GSM or CDMA. Then make sure your SIM card/Carrier is using the same band. For example Verizon is CDMA (you will need to have a CDMA iPhone).
• American CDMA carriers:
Verizon, Sprint and whoever uses their networks (Virgin, Boost, Alltel)

• American GSM carriers:
AT&T and T-Mobile, and whoever uses their networks (Suncom, Pure)

First You need to check if the phone is unlocked then we can figure out what the problem is.

so

1. Dail *#06 on your keypad

your IMEI number will appear copy it and

2. Go to www.imei.info this website will show you everything about your device including what network is locked to.

Please do this then we can take it from there.

I awaits your reply.

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