iPhone 6S locked to T mobile; unable to switch carriers

magenta2275735

    I have a IPhone 6S . I was with Ultra Mobile earlier . I switched to Cricket wireless last week. The phone is locked to T mobile . We called T mobile telephone support  . The rep said that the phone was unlocked. But, the phone is still locked to T Mobile. Whenever I put the Cricket wireless SIM, I get a error message that the SIM is not supported.

    I see from the online forum that so many other people had had a similar problem and have got it resolved.

    Please help me in resolving this issue.

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