Ericsson made some interesting accessories for the T28, like the "CHA-10 Chatboard" (a QWERTY keyboard for text messaging), the "MP3 hands-free kit HPM-10" (an MP3 player with an MMC card slot and standard 3.5mm headphone jack) and the aforementioned "Bluetooth phone adapter DBA-10".
Apple's Lightning adapter will also let last year's docks remain relevant, while standard 3.5mm inputs ensure compatibility with nearly any audio source.