Offer Up: they want their money back?

I listed my iphone 5 on offer up. Someone messaged me with an offer of $200. So, I met the girl and her boyfriend and gave them my phone. They looked it over, checked everything out, and agreed to buy it from me, and gave me $200 cash. They next day, the girl texts me and says "My service provider won't activate the phone, i want my money back". The girls boyfriend texted and said he will be at my practicee and disrupt my practice because they want their money back. DO i have to give it to them? Its not my fault their provider didn't accept the phone.

You are correct that it is not your fault, but sometimes it is better to take the easy way which would be just giving them their money back and avoiding the trouble. People who want to do it can cause a lot of trouble without getting in trouble themselves. If you do give them their money back and try to sell it again you should check out the information here. You probably know this, but just in case you don't, here's the link.

http://artoftheiphone.com/2009/02/10/how-to-activate-a-used-iphone/

Tell them if they bring the phone back at [time that is convenient for you], you'll give them a refund. You're not just going to take their word for it, and you're not going to let yourself be pressured into doing something stupid because they can't wait to resolve this politely. But yeah, if it's in the condition you gave it to them in, you might as well take it back. Maybe you can get a better offer from someone who's already checked with their service provider.

Actuaully if the phone is locked and you didn't tell them, then yes you should refund them. Make sure you test it when you get it back and that its working fine and doesn't have their ID on it, etc., I would do all that first before refunding.