How long is a SIM CARD valid


    Hey guys,

    i bought a STARTER KIT in March 2015 with a $50 Simply Prepaid Plan. I used it one month, after this period i had to go back to Germany.
    In May, I´m back in the US. Did my SIM CARD still work, if I do a "refill" (with a Refill Card or Credit Card).


    And, can I find the SIM CARD NUMBER on my T-Mobile Account. I have two SIM CARDS (one German and one US) and I don´t know which one is the US. On one there are some letters beside the NUMBER. 60.00 and TM9252 (I think this is the US one).


    Thanks in advance.

    Best regards from Germany.


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