Locked Boost Mobile Phone on T-Mo Network?

    My mother accidentally broke her iPhone so she is searching for a replacement. She was told today by T-Mobile that she could use a Boost Mobile Blackberry, new in box and never unlocked, with no problem on the T-Mo network by putting in her SIM card and then it would be ready to go. I'm honestly just trying to save her some time and money by confirming that this is not possible and she would need the phone to be unlocked first. Thanks.

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