MagicJack, stylized as magicJack, is a service that allows people in the United States and Canada to make phone calls over the Internet. This type of phone service is called Internet-based telephone service (VoIP).

Originally, MagicJack required a computer to work. Users connected a small device to their computer, and with an internet connection, they could make calls. In 2011, MagicJack introduced a new model called MagicJack Plus that does not need a computer, though users still need an Internet connection.

The MagicJack device works with a specific phone service provider, YMAX Corporation, which also offers local phone services. Voicemail is saved on MagicJack's servers and can be accessed directly by phone or received via email with audio files. Users can also download updates for the MagicJack device from third-party software providers.

Dan Borislow invented MagicJack in 2007 and, along with Donald Burns, invested $25 million to start the company. Borislow applied for patents with the U.S. government for the product.

The first MagicJack product, released in 2007, was a USB device that allowed users to make phone calls over the Internet. It included both the necessary software and hardware to connect traditional landline telephones to a high-speed Internet connection.

In September 2011, MagicJack introduced a new model called MagicJack Plus. This version eliminated the need for a computer after the initial setup, connecting directly to a modem or router via an Ethernet port. It also featured a standard phone jack and an AC power adapter for easy connection.

The company promotes its products through TV infomercials and its website, where Dan Borislow is credited with inventing MagicJack and founding YMAX. Borislow holds several pending patents related to VoIP technology.

In July 2010, YMAX, the creator of MagicJack, merged with VocalTec to form MagicJack VocalTec Ltd, which is based in Netanya, Israel, and is listed on Nasdaq under the ticker symbol CALL.