The number is a Washington area code and comes form an auto-responding MSN account which advertises adult webcam sites. There is no real human on the other end of the phone number or the MSN account.
Beware-an ugly old man could be sending those texts to you, and some of these numbers take control of your cellphone after you reply. There is a code in the scammer's email address that sends a reverse SMS. Some people on whocallsme have been charged premium rates and had no clue how to make it stop.
Nobody on this thread checked their bill-I think it would be a good idea.