Not Receiving Int Text Messages from AT&T Network.
I've had texting issues for the past week or so. Friends of mine in the US who's carrier is AT&T are unable to send text messages to me in Australia (my carrier is Optus), when in the past this was not an issue. When I text them they receive my text messages.
I'm able to receive text messages from other American phone carriers and my friends can send to other Australian carriers such as Vodafone except Optus. However with AT&T I get nothing.
This has been a problem now for a week or so. Please help.