the i870 adds selective dynamic group call, mp3 support from 8-192 kbit/s (up to 320 kbit/s with a firmware update), external music controls, midi/wav support, and transflash/micro sd support for cards up to 2 gb-to-date. the i870 also features an improved camera found on the i850, but the resolution has been increased to 1.3 megapixels, and the video recording up to 30 seconds is limited only to the size of memory. other than the added features new for the i870, the phone retains all the features that made the i860 one of motorola's hot-selling iden phones.