On iPhone and iPad, the “Messages” app combines both functions. The classic Text message is displayed in green, an iMessage is highlighted in blue.
An Text message is sent as standard via the cellular network. An imessage for windows concept is sent online.
An SMS can be received by every mobile phone owner. An iMessage can only just be sent to owners of Macintosh, iPhone, iPad and ipod itouch.
Your iOS product instantly detects if the recipient can obtain an iMessage. If this isn’t the circumstance, a classic SMS will be dispatched.
Whether you send out an iMessage or an Text message, you usually see in the text field (see picture).