Can I pay my T-Mobile iPhone plan entirely at once?

I have to pay an amount per month for a period of two years. I'm already paying this fee for around 6 months now. Can I pay the rest of the plan at once? How do I do that?

I think it's possible, contact t-mobile

Yes but it would end the service you currently get and you would need to either start a new plan perhaps on a 30 day rolling contract or opt for pay as you go, you could also have your phone unlocked which T mobile will be able to do and then move to another network for your services.

What you do is call them and say that you want to pay off the rest of your contract, they will let you do that and then you decide what you want to do next, if you want the phone unlocked the cheapest way is usually by asking the network to do it which they do via the IME number assigned to your phone.

I did this recently with Tesco mobile, i bought out my contract by paying it off, gave my old phone to my daughter and had them unlock it so she could use another network, they only charged me £20 and would have done it free but the phone was less than a year old so they applied a small fee.