In article , Keith Nuttle
wrote:

A friend of mine has linked her SO's iPhone 6S, I think, to his Windows
8.1 computer. She did this trying to get the contacts from his old...

I use bluetooth to keep the contacts on my phone and computer in sync
all of the time. To break the connection, all she has to do is turn
off bluetooth on one of the devices. Some time it is more convenient to
transfer pictures by bluetooth from my phone to the computer, rather
than fuss with sending them .

that does not apply to iphones, the subject of the question.

One of the things that was developed on the Old Palm handhelds was the
ability to transfer vcard though the wireless connection. While today
it is done through bluetooth, the function is still available on todays
phones, or at least some of the phones.

no it isn't. smartphones do not use bluetooth to sync stuff because
it's very slow and has limited range.

these days, just about everything is done over wifi and sometimes usb.

bluetooth is suitable for headphones, btle accessories, setting up peer
to peer wifi and also to aid location services. not syncing.

I turn the bluetooth off on both the computer and the phone. I only
turn it on when I want to transfer something. I do not want the
Bluetooth transmission on when I am out in the world.

that's incredibly stupid.