so people dont communicate any other way than using sms with android/windows/linux people?
Android messaging is a hot mess. Hence why people use Skype, WhatsApp, FB Messenger, Snap, Insta and whatever else you want.
Sorry but I want all my comms in ONE app. Not 6 different ones. Anything owned by FB is a NO GO. Period. I don't care if 100 billion people use it. I'm glad it works for them. 98% of the people I talk to, have iPhones. Those that don't, get SMS. The end. I don't want to guess what new app their using, nor do I want to have several apps just to talk to 1 person.
iMessage has some bugs, no doubt but its by far and away, the best messaging app on iOS, period! Syncs to all my devices.
Besides, who doesn't have their mobile next to them all the time anyways? Also, are you really using linux as an example? Lol
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iMessage refuses to send texts to to one of my contacts using my iPad, no problems with iPhone. Messages to other contacts works fine from the iPad.
Is it sending as a text or iMessage on the other devices? If it's sending from one and not the other, the message thread is invalid. Delete it and start again.