This number text me "Need a simple and easy payday loan up to $1500? Visit www.FastCheckAdvance.com for INSTANT approval, get cash in one hour or less! (2optout rply stop)". Didn't call back or sent reply.

I got this the exact same text message, word for word, a few hours ago from the same number. I texted "stop", if I get more from them, I'll come back here and update. I have no idea where they could have gotten my number from though, I don't give it out very often. They better not text me again, I don't have unlimited texting...

My message from this number was

"Need a fast payday loan up to $1500? Visit www.FastCheckAdvance.com for INSTANT approval, get money in minutes!(2optout rply stop)"

The people who sent this crap are apparently located here (based on their url):

15111 N. Hayden Rd., Ste 160, PMB 353
Scottsdale, Arizona 85260
United States
(480) 624-2599 Fax -- (480) 624-2598

Got the same message. Hope my number wasn't sold somehow

Yes, your number was sold, it says so at the Company's website.
"Why did I receive text messages?
Text messages are only sent to people that have enrolled in the text message program at www.FastCheckAdvance.com or through a FastCheckAdvance partner where you agreed to the privacy policy and terms of service which includes subscribing into the text message program. Often you enroll in receiving text messages from third parties, and may not even realize you have done so. If you would like compliance information of your subscription please see below."