Is this a fraudulent text message?

Yes

Spam, sure. From ATT? Probably.

Scam texts don’t normally have you reply with “yes”, they either have a link or a phone number. I don’t think it’s a scam but do you really want more texts? You can see details of ATT’s phone deal for iPhones on att.com, no need to have them text the details if it is legitimate.

You can always see the details elsewhere but that doesn't prevent ATT from sending spam. 

Thanks all. It looked fishy to me. 

Funny thing is my phones were bought through Verizon. I recently ported them to att so how would att know whether they were paid off or not?

@Pete10k well... They would know that you don't have a loan with them, I suppose! Like @sandblaster wrote I wouldn't respond regardless!