On iPhone and iPad, the “Messages” application combines both features. The classic SMS is displayed in green, an iMessage is certainly highlighted in blue.
An SMS is dispatched as common via the mobile network. An imessage windows message is sent over the Internet.
An SMS can be received by every cellular phone owner. An iMessage can only just be delivered to owners of Mac, iPhone, iPad and ipod itouch.
Your iOS unit automatically detects if the recipient can acquire an iMessage. If this isn’t the circumstance, a classic SMS will be delivered.
Whether you send an iMessage or an SMS, you always see in the text field (see photo).