I am a T-mobile user and got two "Dear Homeowner" mortgage spam text messages in the span of 7 days. The messages are identical to those described above but from a different phone number with same area code: 323-236-7284.
I went to AT&T's home page, looked up the 323-895-0517 number, and it is on the AT&T network, so call AT&T to report the phone number. I just did. Explain to AT&T that the user of that number needs to be told to cease this illegal activity. It's the same as receiving an unsolicited call when you are on the DoNotCall.gov list, which I am. SPAM carry's heavy penalties in the USA. Remind AT&T of this as well. This is the also the same as email SPAM in the USA. Unsolicited electronic messages are SPAM. Also tell AT&T about this page and how many people are reporting the issue for the number 323-895-0517.