Someone who uses an iPhone or iPad can correct me....
The app on these iOS devices for messaging is called Messenger. If you send a message to another Messenger user (Text/SMS or Picture) it is considered to be an iMessage and goes via WiFi/mobile data.
If you send a text/SMS or picture that is not going to another device running Messenger, then it goes as SMS or MMS as appropriate. Therefore it can cost.
The message bubble in Messenger is blue for iMessage and green for SMS/MMS.
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