T-mobile now has a No Contract policy for their cell phone service.
PTA members receive a 14% discount and the costs are on this page http://www.1tmo.com/PTA/New.pdf
Not a PTA member, join or check to see if your employer receives a discount:https://business.t-mobile.com/advantage
A crude estimate of the actual bill would be the PTA cost plus 22% for taxes and fees.
Therefore
One Line total about $52.46
Two Lines $83.94
Three Lines $94.42
Four Lines $104.92
Five Lines $115.41
That is figuring Unlimited voice, text and 500mb of data. After you use 500mb they throttle down your speed.
If you only need one line its cheaper to go with https://republicwireless.com/ cost is $99 for the phone plus $19 per month, actual monthly bill after taxes is under $24
I had this phone and plan for a month. All worked well except the phones battery life did not last an entire day, so I returned it.