Forget WhatsApp and Facebook. Theresa May’s bill will mean you may need to ditch your smartphone.

You may have noticed WhatsApp’s latest update that increases the privacy of any content you send over the app. All messages are now encrypted from end to end, protecting what you send from being accessed by criminals, the state and even WhatsApp itself. This reinforcement of users’ privacy comes at a crucial juncture for the changing way our private messages …