Do they charge to upgrade an iphone at T-mobile?

I was just arguing with one of my parents and he/she doesn't want to get me it because he said they will charge him $500 or something to upgrade which is hard to believe and i'm waiting for the iphone 6 & the most dumbest thing is he/she said he/she is going to get it to switch out his galaxy 5 (i think that is the one he has) just to get an iphone & i'm sure they will charge him more than me because he doesn't have an iphone so please help i want to know if they charge or don't charge and how much they do right now i have a iphone 5s

As you know T-Mobile does not have any contract. However your parents are somewhat correct about the upgrade price. You can upgrade to any new phone however you have to make monthly payments on it for two years. For example lets say you wanted a new phone the iphone 5s

Each month you would pay $27 for 24 month (2 years)

$27.00 x 24 = $648.00 (the entire cost of the phone at the end of 2 years)

So now lets say my phone bill normally is $60.00 for my tmobile cell phone service. Then you need to add $27.00 to the bill each month so now I'm paying $60.00+$27.00 = $87.00

So I would have to pay $87.00 for 2 years for the phone service and the iphone 5s

So if you want to get the iphone 5s, you would need to add $27.00 each month to your parent's phone bill for the next 24 months.