Text messages from iPhone to iPhone
i sent a txt message last night from my iPhone to another iPhone, the message was sent blue, so iMessage but then it changed to green and on the top it said txt message and the bottom right it said delivered. This morning it’s back to blue. What would make it do that? Go from blue to green back to blue again on its own. And last night the read receipts icon which are usually on disappeared and this morning the icon is back once the message turned back to blue on its own. What does this all mean?
iPhone XR, iOS 14