turn off sharing network details between iOS devices?

wackymacky

macrumors 68000
Original poster
Sep 20, 2007
1,534
43
38°39′20″N 27°13′10″W
A "feature" of iOS10 and macOS now, I've just noticed, is to auto-join networks across all devices if wifi is turned on if you sign in with one device.

Is there a way to turn this off?

If I log on to a free (and therefore often somewhat insecure) wifi network, I routinely use a VPN.

I noticed the other day however that when I joined a airport lounge wifi with my laptop at the airport, (and was securing the macbook data with a VPN) my phone signed it self into this non encrypted using the wifi password I entered on my macbook, and was happily sending packets of email data etc from my pocket without me knowing.
 

I7guy

macrumors Core
Nov 30, 2013
23,473
11,659
Gotta be in it to win it
A "feature" of iOS10 and macOS now, I've just noticed, is to auto-join networks across all devices if wifi is turned on if you sign in with one device.

Is there a way to turn this off?

If I log on to a free (and therefore often somewhat insecure) wifi network, I routinely use a VPN.

I noticed the other day however that when I joined a airport lounge wifi with my laptop at the airport, (and was securing the macbook data with a VPN) my phone signed it self into this non encrypted using the wifi password I entered on my macbook, and was happily sending packets of email data etc from my pocket without me knowing.
Can't you turn on, "ask to join networks"?
 

C DM

macrumors Sandy Bridge
Oct 17, 2011
49,618
18,161
A "feature" of iOS10 and macOS now, I've just noticed, is to auto-join networks across all devices if wifi is turned on if you sign in with one device.

Is there a way to turn this off?

If I log on to a free (and therefore often somewhat insecure) wifi network, I routinely use a VPN.

I noticed the other day however that when I joined a airport lounge wifi with my laptop at the airport, (and was securing the macbook data with a VPN) my phone signed it self into this non encrypted using the wifi password I entered on my macbook, and was happily sending packets of email data etc from my pocket without me knowing.
That sounds more like Keychain and has been around for some time. Try turning that off if it's enabled in iCloud settings.
 

Justaguy48

macrumors member
May 2, 2017
64
52
Just kept wifi turned off until you want to use it. I am in the same boat as you, using VPN on unsecure networks. I just keep phone, and iPad for that matter, wifi off until I'm at home, or work network with secure wifi.
 

chrfr

macrumors G3
Jul 11, 2009
9,878
3,692
A "feature" of iOS10 and macOS now, I've just noticed, is to auto-join networks across all devices if wifi is turned on if you sign in with one device.

Is there a way to turn this off?
These are shared via the iCloud keychain. If you disable that, the devices will stop sharing network information, but you'll also lose sharing of passwords and logins.
Edit: just realized that @C DM posted this already.
 
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