Not all VPN services require that you pay. There are, in fact, many excellent free VPNs. But all of the free VPNs we've tested have some kind of limitation. Some limit you to just a few simultaneous connections or devices on an account. Others restrict you to a few hundred MBs of data per day or per month. Others limit you to just a handful of servers. Still others do all of the above.
The servers of the company are numbered around 2000, which might be less than other VPN services. However, the spread is wider as it provides more than 148 cities and over 94 countries to choose from. The company allows for up to three devices to use its service. As with NordVPN, this company also keeps the exact numbers and other details around its operations rather vague.
Similarly, many VPN companies would rather not have to deal with the legal implications of their services being used to download via BitTorrent. BitTorrent is, of course, not inherently illegal but it is often used to pirate copyrighted material. Very few VPN companies outright ban BitTorrenting on their servers, while others restrict its use to specific servers.

What makes NordVPN stand out in terms of security can also be applied for making it a real private network. NordVPN’s privacy standards are highly advanced, such as the Onion Over VPN feature, which includes the TOR network service as another layer of privacy. The VPN’s double encryption makes it impossible for a middle-man to see what is transferred through the tunnel. In case of any intrusion, there is also a kill-switch, which is an added bonus we welcome whole-heartedly. NordVPN also utilizes an anonymized login policy that conceals your identity further, making the service privacy-friendly.

We used to advise people to do banking and other important business over their cellular connection when using a mobile device, since it is generally safer than connecting with a public Wi-Fi network. But even that isn't always a safe bet. Researchers have demonstrated how a portable cell tower, such as a femtocell, can be used for malicious ends. The attack hinges on jamming the LTE and 3G bands, which are secured with strong encryption, and forcing devices to connect with a phony tower over the less-secure 2G band. Because the attacker controls the fake tower, he can carry out a man-in-the-middle attack and see all the data passing over the cellular connection. Admittedly, this is an exotic attack, but it's far from impossible.
TorGuard also lacks extra features that are nice to have, like automatically connecting to the VPN when you’re on an unknown Wi-Fi network (which IVPN offers) or split-tunneling to choose which apps do and don’t route through the VPN (which ExpressVPN supports). And it offers no option to automatically connect to the fastest server, a feature our top pick lacks as well. But if you have above-average knowledge of networking, you’ll appreciate TorGuard’s more in-depth settings pane, which allows you to add scripts or kill specific processes when the VPN disconnects—neither our top pick nor popular services like Private Internet Access allow that kind of control.
Many may not choose to use ZenMate for its location, as Germany falls under the internet privacy and data disclosure of the EU Commission. However, there have been ZERO cases of the provider cooperating with authorities. There is some session/connection logging, according to the privacy policy, but if your premise is to engage in P2P/Torrenting or unblocking geo-restricted VOD services, ZenMate is a great choice.
When we test VPNs, we generally start with the Windows client. This is often the most complete review, covering several different platforms as well as the service's features and pricing in depth. That's purely out of necessity, since most of our readers use Windows (although this writer is currently using a MacBook Air). We currently use a Lenovo ThinkPad T460s laptop running the latest version of Windows 10. We periodically upgrade to a newer machine, in order to simulate what most users experience.
Another VPN with a money-back guarantee is CyberGhost. The theme we were seeing here was that when servers are good, they're really good, but when they're bad, they're really bad. However, after looking through Reddit threads, we're not really sure how this ranked in the top three. The biggest thing: This is not the VPN to get if you're looking to torrent or stream, as it's known to be pretty slow. Reddit user NewWorld98 writes: 
Given the aggressive pricing and marketing of other services that don’t measure up to our picks, IVPN’s most obvious downside may look like its price: At the time of this writing, the regular price for an annual IVPN subscription is $100 (about $8 per month). Promotions regularly bringing that down to $70 to $80 per year, but some services have regular pricing of half that. But you shouldn’t pay for a VPN you can’t trust, or one so slow or confusing that you avoid using it at all. We think IVPN’s combination of trust, security, and performance is worth the price. But if it’s too expensive for your needs, consider our budget pick instead.
VPN services, while tremendously helpful, are not foolproof. There's no magic bullet (or magic armor) when it comes to security. A determined adversary can almost always breach your defenses in one way or another. Using a VPN can't help if you unwisely download ransomware on a visit to the Dark Web, or if you are tricked into giving up your data to a phishing attack.
Since we last tested VPNs, we've given special attention to the privacy practices of VPN companies and not just the technology they provide. In our testing, we read through the privacy policies and discuss company practices with VPN service representatives. What we look for is a commitment to protect user information, and to take a hands-off approach to gathering user data.
OpenVPN: OpenVPN is very secure, open-source and widely used. Most VPN services support it, but except for Chrome OS and Linux, few operating systems do. This protocol can be used in either TCP (web) or UDP (streaming) mode; the latter is sloppier but faster. You'll need either the VPN service's client software or one of the many free alternatives. Either way, you'll still need to pay for the VPN service.
KeepSolid boasts of having endpoints in 54 countries and specialised servers designed to allow you access to geo-locked streaming services undetected. While this allowed us easy access to American Netflix, the UK iPlayer endpoint was actually too slow to actually load any BBC’s content, while using the other UK endpoints were invariably detected by the website. Hopefully this will improve over time.
Some virtual networks use tunneling protocols without encryption for protecting the privacy of data. While VPNs often do provide security, an unencrypted overlay network does not neatly fit within the secure or trusted categorization.[citation needed] For example, a tunnel set up between two hosts with Generic Routing Encapsulation (GRE) is a virtual private network, but neither secure nor trusted.[24][25]
CyberGhost operates an ample network of more than 1,200 servers, including 20 in Australia and more than 200 in the US. It has a strong focus on unblocking streaming services like Netflix and Amazon Prime Video. It’s also popular with torrenters and has a dedicated “Torrent Anonymously” option within its apps. Plus, speeds are excellent, making it a great all-rounder. CyberGhost doesn’t log user activity or record IP addresses. Apps are available for Windows, MacOS, iOS, and Android.
A traditional VPN can affect the user experience when applied to wireless devices. It's best to use a mobile VPN to avoid slower speeds and data loss. A mobile VPN offers you a high level of security for the challenges of wireless communication. It can provide mobile devices with secure access to network resources and software applications on their wireless networks. It's good to use when you're facing coverage gaps, inter-network roaming, bandwidth issues, or limited battery life, memory or processing power.