Not receiving *some* SMS messages
My wife switched to the AT&T Prepaid plan recently. It took while on a support call to get everything working and all seemed OK. But today we found that she is not able to receive text messages from our son, who lives locally and is on an AT&T Postpaid plan. She was able to exchange messages with a friend in another state (don't know her provider) and can exchange with me (also on Prepaid), but specifically not with our son (although he received her messages). Any ideas?