For once, I tend to agree with Apple on this – namely the proprietary use of iMessage between Apple phones only.
For those of you who rightly or wrongly use an Android phone (eeewwww, Android – the dirt…… it won’t wash off) send an SMS message to the users of an iPhone, get a green sms bubble, while iPhone to iPhone users get a sexy blue bubble.
Google suggested that we all should use RCS (Rich Communication Services) but it was overwhelmingly shut down by Apple.