First unlocking a device refers to a GSM device which uses a SIM card. For CDMA you will need to flash it. One of the best ways to tell if it's flashed is what carrier it connects to when dialing 611 or your carriers 3 digit custom care number.
Could also be other factors like does your carrier use OTASP? Is the MEID on the account correctly? Is all the MDN info correct? Is the PRL correct?
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