OK, so maybe I should take the 's' off, as I seem to only have one Metro-PCS user. So far.
The issue is that the SMS messages are not getting through to him. Checking his phone, he doesn't have any messages from a short number. On testing, he can't even send to a short number.
Is this something that has been seen with other providers? Is there any way around this except copying his activation messages into an email and sending them that way?