Well, it improves the situation but it doesn't remedy it, at least in my case. I followed DocsDad's advice and blacklisted 6250 in Handcent. No longer get notifications (Thank God) but the messages still accumulate. I have 24 of them this morning. Mine are a bit different from others'; they're labeled VZWPIN rather than VZWMTN. Turns out this problem has been going on for well over a year on various Verizon phones and it is certainly NOT "a third party texting app." It's Verizon's incompetence with their damn "backup assistant." Turning it off doesn't help. Nothing helps.