BlueAnt S4 - Manual (Page 21)

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Using 2 Phones with the S4 (Multipoint)
Up to 2 devices can connect to the S4 at the same time. If either phone rings, you can answer it with the S4.
Use the
Pair Me command to put your S4 back into pairing mode to pair another phone. Any currently connected
phone will be disconnected during pairing, so you will need to reconnect afterwards.
Which Phone is Used for Calls?
When you have two phones connected to the S4 at the same time you can always answer an incoming call on
either phone.
If you initiate a call through the S4 (for example by saying
Phone Commands ) then the call takes place on the
primary phone: the one that connected to the S4 fi rst.
Note: Only the primary phone can play music through the S4 via A2DP.