Say I send a message to someone who has a phone with push notifications enabled, showing message previews. Will the phone still be connected to the VPN when it wakes up to display the message? Because my iPhone doesn't seem to stay connected to my VPN when it sleeps, at least not reliably.
There really should be a "never use the internet without VPN" mode on devices.
Valid point. Afaict, vpns I've used route all network activity regardless of phone state, but that's likely dependant on the service.
That exists on Android. VPN on ios is known to be rather leaky.