MMS – multimedia messaging service. Basically, the ability to send pictures, audio and/or video in a text message.

Nomophobia – the official name for smart phone addiction. It’s defined as the fear of not being with your phone. Really.

Opt-in – when someone takes an action (texting a code to your number, etc.) that will add them to your list. Users cannot be added to your list without their express permission.

Opt-out – when someone on your list decides they no longer wish to receive text messages from you. Each message sent must contain the ability for the user to opt-out.

SMS – Short message service. Basically, a technology that enables the sending and receiving of messages between mobile devices. The term SMS is used interchangeably with the term text messaging.