Activating the iphone 3gs

my iphone displays message
NO SIM CARD INSTALLED
insert a valid SIM with no PIN lock to activate iphone??

Have you tried putting another SIM into the iPhone?
Check out this Apple document -> Troubleshooting iPhone hardware
"No SIM installed" alert (GSM models only)
Remove the SIM card (micro-SIM on iPhone 4). Insert the SIM eject tool or the end of a small paper clip into the hole on the SIM tray. Press firmly and push it straight in until the tray pops out. See this document for more information.
Verify the SIM card is not damaged or dirty.
Reinstall the SIM card.
Turn the phone off and back on.
Wait approximately two minutes, then see if  iPhone detects the SIM card and if it will register on the network.
If that doesn't work, try another SIM card, if possible, to see if it is detected.
Note: If you need to send your iPhone in for service or if you want to temporarily use a different phone, you may be able to use the SIM card inside your iPhone with another GSM phone.

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