Connecting to a Different Phone
To connect to a different cell phone, the Bluetooth system looks for the next available cell phone in the order in which all the available cell phones were paired. Depending on which cell phone you want to connect to, you may have to use this command several times.
1. Press and hold 
for two seconds.
2. Say “Bluetooth.” 3. Say “Change phone.” . If another cell phone is found, the response will be “<Phone name> is now connected.” . If another cell phone is not found, the original phone remains connected.
See also:
Call Waiting
Call waiting must be supported on the cell phone and enabled by the wireless service carrier.
• Press to answer an incoming call when another call is active. The original call is placed on hold.
...
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