Apple's response to iPhone SMS security loophole: 'Use iMessage'

The original binary SMS will contain the original sender address and the reply-to address (the latter being in the User Data Header). The 3GPP specification 23.040, which explains the coding, calls for implementations to consider the security issues and advise the recipient that the reply-to address is different from the sender address. Of course iMessage verifies addresses, but SMS does too. The sender of an SMS from a handset cannot even insert their own address as it is picked up securely by the mobile network. The best way to handle this issue is for the receiving phone to include all the data. Has anyone looked at how other smartphones handle this type of SMS?