At this week’s CTIA trade show in San Francisco, Research in Motion, developer of the BlackBerry, announced the release of its first flip-design phone. Based on the candy-bar-style Pearl, the Pearl Flip 8220 will include a 240x320 primary display, a camera, music and video capabilities, and Wi-Fi. Like the Pearl, the Pearl Flip has been designed for the consumer market. Instead of a full keyboard, the device includes two letters on each key and also has a trackball, similar to the Pearl’s. T-Mobile will be the exclusive carrier of the Pearl Flip in the United States. Although no street price or relapse date were provided at the show. It is widely expected that the Flip will be available by the holiday season.