Prepaid SIM card activation for Postpaid acct. and ph.#

magenta4993112

    I lost my SIM card for my post paid account.  I see a new SIM card will cost me $25 fee and this single mom doesn't want to spend it.  My question is this, can I purchase a prepaid SIM card (unactivated), put it in my unlocked phone and have t-mobile customer service (611, or online) activate the prepaid SIM for my postpaid phone number and current plan?

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