Start with what you need
A VPN creates an encrypted connection between your device and a VPN server. It can help protect traffic on shared networks and change the IP address websites see. It does not make every online action anonymous, remove malware or replace strong account security. Start by deciding which devices you use and what you want to protect.
Read the privacy policy
Check what the service says about account information, connection diagnostics and usage counters. Look for clear explanations of why information is needed and how long it is retained. A short no-logs slogan is not a substitute for a complete policy.
Check your actual device
A logo for an operating system is only the beginning. Find a compatible installer, check the supported architecture and read any release-channel notes. Browser extensions usually cover browser traffic; a desktop application may offer a wider scope.
Compare data and device limits
Data allowance and device allowance are separate. An unlimited-data plan can still limit how many clients you can sign in on. Check the access period, payment terms and refund conditions as well as the headline price.
Test a normal day
Try the networks and applications you actually use. Check whether you can connect, switch locations and reconnect after a network change. Keep HTTPS enabled, use unique passwords and install software updates. Choose a VPN as part of a wider privacy routine.