HTC Sensation not able to open text messages sent from iPhone4 iOS6

10-11  Source: Network gathering  Views:1 

Up until I installed iOS 6, my friend had no trouble receiving and opening a standard (green) text message sent from my iPhone4. After the new install, his phone receives the message but as a text file that won't open. He hasn't changed anything on his end nor have I changed anything else, so I'm assuming this must be the culprit. Has anyone else had a similar issue? Thank you for any suggestions.
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