Using a VPN will prevent most kinds of DNS attacks that would redirect you to a phishing page, but a regular old page made to look like a legit one in order to trick you into entering your data can still work. Some VPNs, and most browsers, are pretty good about blocking phishing pages, but this attack still claims too many victims to be ignored. Use common sense and be sure to verify that websites are what they say they are by looking carefully at the URL and always visiting HTTPS sites.

A “kill switch” goes by many names, but the term describes VPN software that shuts off all network traffic in and out of your computer if the encrypted connection fails. A hiccup in your Wi-Fi or even with your ISP can cause a VPN to disconnect, and if you then maintain an unsecure connection—especially if the VPN software doesn’t alert you that it’s no longer protecting your traffic—that wipes out all the benefits of your VPN. We considered kill switches to be mandatory. And although we looked for apps that made it easy to add rules about when to activate kill switches, we considered special config files or manual firewall tweaks to be too complex. (iOS doesn’t support any kill-switch features; we address a few iOS-specific problems that apply to all VPN services in a separate section.)
The first step to security is usually a firewall between the client and the host server, requiring the remote user to establish an authenticated connection with the firewall. Encryption is also an important component of a secure VPN. Encryption works by having all data sent from one computer encrypted in such a way that only the computer it is sending to can decrypt the data.
CyberGhost is one of the better VPNs out there by virtue of having a number of helpful features, such as a killswitch, which will halt all traffic if the VPN tunnel is suspended for whatever reason, ad blockers and tracker blockers, and built-in shortcuts to sites and services which are either geo-locked or the likes of Twitter and Wikipedia, which are frequently censored by authoritarian goverments.
— Mullvad has added iOS support for the new WireGuard VPN protocol. The service has also added an onion site at http://xcln5hkbriyklr6n.onion/ so that Tor users can get Mullvad accounts and download software completely anonymously. It is also urging users to upgrade their client software to at least version 2018.5, as earlier versions will not be supported after March 22, 2019.
They even offer the most generous simultaneous connection count, with six simultaneous connections through their network, where everyone else offers five or fewer. NordVPN's network isn't as large as some of their competitors, so if you're trying to obfuscate your tracks, you might want a company with more servers. Otherwise, this company is clearly providing a winning offering.