BlackBerry smartphones identifying a really unlocked 8320

I recently bought a used version of US T-Mobile 8320, but it does not recognize my SIM card overseas. Said "Invalid SIM" and I get the indication 'SOS Only' of some networks and SIM card works in another GSM phone.  Is there a place to go to set the frequency of the network for GSM carriers overseas?  Or is the SIM card, I did not compatible with the Blackberry?

Thank you

Jim

Read this and compare your device:

http://www.BlackBerryFAQ.com/index.php/How_do_I_determine_if_my_BlackBerry_is_%22unlocked%22%3F

If it is still blocked, read this:

http://www.BlackBerryFAQ.com/index.php/How_do_I_unlock_my_BlackBerry%3F

Tags: BlackBerry Smartphones

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