[machrider]

Any idea if they're layering any additional security onto the unsecured WiFi connections it seems to prefer? (attwifi, xfinitywifi, etc. are all unencrypted, and I personally only use them in very limited ways for that reason.)

[kkielhofner]

VoLTE over IP implementations typically establish an IPSEC VPN back to the operator network, authenticated using the SIM with EAP:

https://en.wikipedia.org/wiki/Extensible_Authentication_Prot...

[machrider]

That makes sense. I'm also curious about data though. Unless they tunnel all your traffic through a VPN, you just have to hope your apps and web sites are using https correctly. (And if they did tunnel all traffic through Google servers, it would raise a different set of concerns...)

[LeoPanthera]

I thought recent versions of Android automatically activated "Google VPN" on open wifi.

[mentat]

If you explicitly configure them, it doesn't appear to for "LTE data". It has an autodiscover mode that will open a VPN before using wifi for LTE data.