How often do you have to buy minutes for a prepaid t-mobile phone??

I was looking at getting another t mobile phone and i was wondering before i actualy make the purchase how often do you have to purchase minutes (like the cards)?? Thanks!How often do you have to buy minutes for a prepaid t-mobile phone??the increments are usually 30,60,90 days for expirationHow often do you have to buy minutes for a prepaid t-mobile phone??you know it really depends. if you text alot, then it gets very expensive very fast. I have t mobile prepaid and i want a plan. If you dont text alot, or talk alot, then yea go ahead and get it.

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