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Back of T-Mobile retail package
The T-Mobile HTC One will only cost you $579.99, and you can make this amount even easier to pay for by paying just $99.99 upfront and $20 per month for 24 months. You can choose to pay it upfront and have no obligation at all to T-Mobile, hardware or contract. Other carriers may charge you just $199.99 for the HTC One, but the $20 per month fee is hidden in your monthly payment and they never stop charging you this as long as you are with that carrier.