using T-Mobile app with prepaid on LTE tablet ?

magenta6062628

    Because this LTE tablet can not receive SMS or make phone calls I would like to use the app to check data usage and make refills. When I try this using the app I get the following message: "Sorry, your account information is not currently available, please again later.  Dial #225# For your current balance.....".  This makes a week with the same message so clearly not useful error message.  When I try to add this number to my T-Mobile account by putting the SIM in another phone so as to be able to receive the SMS confirmation code, the code I enter is never accepted with a message about the code not being valid.  I've been told that you cannot have a prepaid account associated with a My T-Mobile account ?  So is the only way to refill by calling prepaid number ( seems stupid with a tablet ) ?

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