Steve Graham - typed:

   No. Whereas some BT headsets can happily be paired to more than one
device they are effectively paired to one at a time. I would speculate
that a dedicated pairing button is just that - a button that pairs the
headset to other devices without having other (major) functions. If your
BT headset could answer calls from multiple phones, it would need to
either be paired to a default device to initiate calls or be able to
select before making a call.
   Headset devices are currently rather dumb; the new SE Akono HBH-660
has a small LCD display which I suppose you could always ask someone
else to read for you if removing it from one's head is inconvenient ;)
Voice prompts would be more appropriate for a device stuck in your ear
to give more functionality!

HTH

Maybe. It depends.

There are a few issues:

1. Before you can consider using a BT headset with a phone, it must be
paired. Being paired means that the headset and the phone know about
each other, and have shared secret information and a special passcode
number. Most SonyEricsson headsets let you pair with more than one
phone; I believe the newest may not. Other headsets seem less likely.
No multiple pairings == absolutely impossible.

2. How do you answer the phone with the headset?

The "headset profile" was originally used for bluetooth headsets.
Newer phones usually support both the headset, and the newer handsfree
profile. Nokia phones _only_ support the handsfree profile.

Normally, when you are using the headset profile, the phone and the
headset are both on, but are not actually in communication with each
other. They're just a pair of random Bluetooth devices. If a phone
call comes in, the phone looks around, finds the headset, establishes
a link with it, and makes it ring. Pressing the button on the headset
answers the phone.

If you have multiple phones, you can answer any of them as long as
they're all paired with the headset.

The handsfree profile is different. It keeps an active link open
between the phone and the headset all the time. Since most (all?)
headsets only support one _active_ connection, even if they support
multiple pairings, you can only answer one phone at a time because the
phone expects the headset to be connective to it all the time. If the
headset's not connected to the phone, the phone won't use it.

So - if you're talking Nokia phones, you must choose in advance which
phone is going to ring the headset. If you're using other BT phones,
you need to make sure you've paired them using the headset profile. If
you're using a SonyEricsson P800/P900, that's easy since it only
supports the headset profile. With other phones/devices, I do not know
if you can force them to pair using the headset profile.

Good luck.

gopi.