I no longer use an iPhone, so I have deregistered my number succesfully. The problem is that my wife's iPhone always defaults to iMessage when trying to send a text to my number. On her phone, I've deleted any old conversations that were iMessage messages, I have even removed my contact information from her phone, but every time I try to send a message from her phone to my number, it defaults as a blue iMessage. I've started a new conversation to her phone by sending a text, these come in fine, but if she tries to reply, it's blue again and says cannot be delivered, but then can send it as a green sms (on every message this happens). I've send a test from another phone (that has never sent me a text before) that has iMessage turned on, and to my number it's coming through as a text fine. I am at my wits end as to what is stuck on her phone that's preventing her from defaulting to sms to my number which is no longer registered with Apple. Has anyone else experienced this?