Why doesn't my iPhone send or receive calls or texts?

I purchased an iPhone second hand on t-mobile, 3G works fine but can't receive any calls or texts or send them. Thought the IMEI might have been blocked. Any ideas?

Http://www.imei.info/iPhoneBlacklistCheck/

Use this site to check if the IMEI is blocked/blacklisted. If it is, then this is your problem.

A barred phone is when a phone is reported as lost or stolen to a network and its IMEI (serial) number is blocked. This makes the phone unusable across all networks with any SIM card. The only way to unbar a phone is for the original owner who originally asked it to be barred to contact the network asking for it to be reactivated - this would happen if the phone was lost and then found again for example.
Unless the original owner of the phone asks for it to be unbarred, it can't be unbarred. It is permanently barred across all networks with all SIMs.

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