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.
The text I got was a little different...I got "Do you owe the IRS and can't pay? Government programs are now available to settle or reduce or eliminate your debt! May we give you a call regarding this?" Still a scam though.