caller tryed to text no response to replied text...humm

Caller sent a text message.  Detail said message was from "1010100001".
The message read: "FRM:AT&T. SUBJ:ACCOUNT UPDATE. MSG:PLEASE REPLY WITH YOUR MAILING ZIP CODE."
In message detail, it said "Message Center: +1-208-597-8917"

Text msg received from same number: "FRM:auto-db@firstregional.com MSG: First Regional Bank urgent notification: unusual activity.  Please verify your information at 8773094313"

I received that exact same text message and I'm confused because I don't even belong to a first regional bank...lol...but I'm curious in knowing how they get my number.

Received a txt msg. from #208-597-8917. Didn't even open it. I'm not going to get charged. Looked at unopened msg. from inbox and it said your pin # is XXXX and it gave four digits. I'm just going to delete it so I'm not charged. I would like to know how my # got on their calling list....