On iPhone and iPad, the “Messages” application combines both features. The classic Text message is shown in green, an iMessage is normally highlighted in blue.
An SMS is directed as usual via the mobile network. An imessage pc message is sent online.
An SMS could be received by every cellular phone owner. An iMessage can only be sent to owners of Macintosh, iPhone, iPad and ipod itouch.
Your iOS system instantly detects if the recipient can obtain an iMessage. If this is not the circumstance, a classic Text message will be directed.
Whether you send out an iMessage or an SMS, you often see in the text field (see picture).