Game Boy Advance
Majesco jumps the gun on the DS's social features by introducing their own program on GBA. While it may be limited by not having a touch screen, it should be cool nonetheless.
Majesco's impressive product specs:
Compatible with both Game Boy Advance and Game Boy Advance SPExchange messages with individuals or groups. Chat in real-time with friends or in private.Long range of up to 3-miles in open settings and several blocks in citiesNo monthly service fees or additional charges for wireless accessSimple user interface with a virtual on-screen keypad for text inputEmoticons and other buddy icons let you customize Wireless MessengerFast charging internal battery port is compatible with the standard GBA SP battery charger or trickle charge when installed into a GBA that is turned onOperates for up to 1 week on a chargeAudible message received alert when plugged into a GBA Messenger that is turned onCan receive and store up to 1500 messages even when not plugged into the GBATwo-way protocol will automatically retry message deliveryMessage sender can request confirmation of successful message deliveryUsers can uniquely name units; these names are then reported in a group query which allows users to see what units are onlineMultiple channels allows users to select the clearest channel to form a group onFrequency hopping, spread spectrum radio automatically avoids interferenceSmall size that includes an internal antenna