On iPhone and iPad, the “Messages” application combines both functions. The classic Text message is displayed in green, an iMessage is normally highlighted in blue.
An Text message is dispatched as normal via the mobile network. An download imessage for pc concept is sent over the Internet.
An SMS can be received by every mobile phone owner. An iMessage can only be sent to owners of Macintosh, iPhone, iPad and ipod itouch.
Your iOS unit quickly detects if the recipient can get an iMessage. If this isn’t the circumstance, a classic SMS will be dispatched.
Whether you send out an iMessage or an SMS, you constantly see in the text field (see picture).