If I buy an iPhone off of craigslist can I get a nano-sim at walmart?

Being the impatient college student that I'm, I'm trying to buy an iPhone 5s off of craigslist. Naturally, the Tmobile store is closed; can I get the correct nano-sim from walmart to activate it?

I'm currently under contract at Tmobile so I'm not sure if they'd have to do it there or not.

Make sure their account is wiped first, I see alot of people post on here that don't do that and are stuck. These are good instructions for verifying an iphone is not stolen or bad http://www.justtext.com/messageboards/20140127095337.html

Since Wally World deals TMobile, you probably can. As long as there's somebody in the electronics section in the middle of the night, and that person knows how to activate phones.

You just need to trim your current SIM to nanoSIM and use it in the iPhone 5S. No need to buy additional SIM from anywhere. If you need iPhone 5S without contract or unlocked cheaper than retail, mail me.