Explain the tmobile Iphones?

Ok so If i go to the tmobile store how much would I pay for an Iphone 5c. On the website it says $49 upfront. Plus $20 every month for 24 months. Is this only for online ordering or also at the tmobile place? And is this a limited offer?

Well as it said, you pay $49 to get the phone upfront & then pay $20/month for 24 months for the service. Simple as that.

No, this is how T-Mobile operates these days. Not a limited offer.

That is not a limited offer, but then you must pay for phone service on top of that.