Refill your prepaid account
https://www.t-mobile.com/support/account/refill-your-prepaid-account
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Refill by phone
You can refill your prepaid account on the phone by calling the T-Mobile Refill Center. Just dial *ADD or click to call
1-877-720-5195.
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Tried to refill prepaid account but calling the above #
(1-877-720-5195) fails to recognize my cell phone #.