Because the candy bar style does not have anything covering the buttons these types of phones offer a key guard that prevent keys from being pushed when the phone is not in use. Several mobile phones using the candy bar form factor include the Apple iPhone, RIM Blackberry the Sony Ericsson, and the Motorola (Sprint) MOTO Q.
See also "The Difference Between a Cell Phone, Smartphone and PDA" in the "Did You Know..." section of Webopedia.
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