I just moved to Australia from America and put a Boost SIM card in my iPhone 8+. I have been able to use iMessage with no problems and text other Apple phones. I just tried sending a group text to both Apple and Android phones, and only the Apple phones got my text. I then tried texting Apple and Android separately, and the same thing happened. I purchased the $30 phone plan and the $15 unlimited international call and text plan, so I should have service. Does anyone know how to fix this problem? I can text Australian numbers without any issues.