I've been using a VPN in the UK on my laptop and phone exclusively for 20 years, and the state has been working with ISPs to make "connection records" for most of that time.
On mobile a VPN isn't always effective in avoid geoblocks. Some apps are able to determine I'm in the UK and still ask for ID - reddit is one for example, if you stumble on to an adult subreddit. Using the web interface avoids this.
The UK has also moved to force ISPs to block certain bittorrent search engines.
The UK is not shy when it comes to invading your privacy or censoring the Internet.
> On mobile VPN isn't always effective in avoid geoblocks. Some apps are able to determine I'm in the UK and still ask for ID - reddit is one for example, if you stumble on to an adult subreddit.
I've never had this issue (using Private Internet Access on iOS).