Did you recently port your number, or change your number? Is this a new device? What kind of phone do you have?
If the above answers are NO, then I would ask if you have ever been able to receive text messages, and if so, then when did it stop - what changed at that point?
Hi Millie-Vanilli. SuzyQ had quite a few great questions for you that would help us find out what's happening with your service. If your friends are getting a "Message Failed" error though, that tells me it may be something further in switch as you mentioned. We may simply need to file a Resolution Ticket. You've already put a lot of work into getting your messages working. So if you're still having trouble with receiving those text messages, please send me a message through http://bit.ly/aUgBIy and then reply to this letting me know the message was sent. I'll have you up and running.
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