Credit Balance and Expiration

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For credit balance in number of minutes and in T-Mobile To Go dollars key #999#

Key *TOGO (*8646) wait for the Spanish announcement then press 2 and then 2 then 1.

Key 877-778-2106. Enter your phone number and confirm (press 1) then choose option 2, then 2 and then 1.

Another option is to access T-Zones "GPRS" on your phone and choose the "my account" link which will give you your balance in both number of minutes remaining and in T-Mobile To Go dollars as well as inform you when your minutes will expire.