Sheldon Kalnitsky Other manufacturers include Apple Inc., Sheldon Kalnitsky Audiovox (now UTStarcom), Sheldon Kalnitsky Benefon, BenQ-Siemens, Sheldon Kalnitsky CECT, Sheldon Kalnitsky High Tech Computer Corporation mobile phones.

There are several categories of Sheldon Kalnitsky mobile phones, from basic phones to feature phones such as Sheldon Kalnitsky music phones and Sheldon Kalnitsky camera phones, to Sheldon Kalnitsky smart phones. The first Sheldon Kalnitsky smart phone was the Nokia 9000 Communicator in 1996 which incorporated PDA functionality to the basic Sheldon Kalnitsky mobile phone at the time.

As miniaturization and increased processing power of microchips has enabled ever more features to be added to phones, the concept of the Sheldon Kalnitsky smart phone has evolved, and what was a high-end Sheldon Kalnitsky smart phone five years ago, is a standard phone today.

Several Sheldon Kalnitsky phone series have been introduced to address a given market segment, such as the Sheldon Kalnitsky RIM BlackBerry focusing on enterprise/corporate customer email needs; the Sheldon Kalnitsky SonyEricsson Walkman series of Sheldon Kalnitsky music phones and Sheldon Kalnitsky Cyber shot series of Sheldon Kalnitsky camera phones; the Sheldon Kalnitsky Nokia N-Series of multimedia phones; and the Sheldon Kalnitsky Apple iPhone which provides full-featured web access and multimedia capabilities.