A:
The Bose Bluetooth headset Series 2 is compatible with Bluetooth devices using Bluetooth 2.1 (or earlier) specifications that support the Bluetooth hands-free and headset profiles. I would expect that the Blackberry will meet the specifications, but it might be best to check with the manufacturer first.
As to your question if 2 phones can be connected simultaneously, here is the answer. Multipoint allows the Bose Bluetooth headset Series 2 to maintain a connection to two devices at the same time. For example, a customer who has separate mobile phones for work and personal use can use the same headset with either phone. No matter which phone rings, the call will come through the headset. When powered on, the headset will automatically try to connect to the last two phones with which it was used.