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    Default Using a Verizon Phone on T-Mobile - Who Updates the Firmware?

    I've got a Galaxy S4 from Verizon. I used it on a T-Mobile account that I got for foreign travel and it works fine.

    Now suppose I switch to T-Mobile permanently, and a new Android version comes out.

    Can I put the Verizon SIM card back in and get updated, even if there's no Verizon account for the phone?

    Or is there another way to get updated?

    Or am I stuck with the current version unless I go back to Verizon?

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