As noted by 9toMac, a bug has emerged that is affecting text messages between iPhone and Android users.
According to a number of reports on Reddit, texts sent from an Android user to an iPhone user are erroneously adding an extra digit to the phone number. The problem primarily appears to affect Android users with an AT&T phone.
In the Messages app, that incoming message from the Android user is then split off into its own messaging thread. When the iPhone user tries to respond within that thread, the message fails to send.
They can respond as normal in the original thread, but when the person responds, the new message is put into the same thread with the incorrect international phone number.
