For the best security, you should use a VPN as often as possible and, ideally, all the time. We recommend that users set the default on their VPN apps to be connected as much as possible. You can always disconnect if it's causing a problem. But that's an ideal, and it's not always achievable. At minimum, you should use a VPN whenever you're using a network that's not one you control, and especially if it's a public Wi-Fi network.
VPNs for Android and other mobile devices are a little trickier, particularly if you frequently move in and out of cellphone coverage. Each time you lose and regain data connectivity, the VPN has to reconnect, which adds a frustrating wait. It's also just less likely that your cell traffic can be intercepted by bad guys, but we've seen researchers prove that it can be done. And considering that law enforcement and intelligence agencies have effectively unfettered access to telecom data, it's a good idea to use a VPN even over cellular connections.
Most mobile devices can automatically connect to any familiar looking Wi-Fi network. That's out of convenience to you, but it's trivially simple to impersonate a Wi-Fi network. Your phone may be connecting to a digital honeypot without you even realizing it. At minimum, you should use a VPN when connecting via Wi-Fi to keep your data safe, even if your device falls for an attack like this one.
Many VPNs have settings for how and under what circumstances they should reconnect if they become disrupted. We honestly cannot think of a reason you wouldn't want your VPN to try reconnecting and encourage everyone to make sure their settings reflect this.
If you're concerned about VPNs slowing your connections or blocking important traffic, you should take a look at split tunneling options. Again, different companies give this feature different names, but the gist is that you can decide which apps will use the VPN for their traffic and which apps can transmit without the VPN.
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