Free Proxy Tools
We run these two checks on a line ourselves before it is handed to a customer, and they are open to everyone. No sign-up, nothing stored.
Go deeper with IPFighter
We recommend IPFighter's free suite to customers for browser fingerprinting, bot detection, DNS and WebRTC leak tests, as it works well with a SimProxies line:
IP score & lookup ↗ Browser fingerprint ↗ Bot detection ↗ DNS leak test ↗ WebRTC leak test ↗ IPFighter proxy checker ↗
Recommended antidetect browsers
Which antidetect browser works best with a dedicated SIM? Undetectable.io is the one we recommend. Give each profile its own SimProxies SIM, set the profile's time zone and language to the SIM's city, and paste the HTTP or SOCKS5 details. GoLogin is a good second choice.
Undetectable.io
A free plan to start, Windows and macOS apps, and local or cloud profiles. Give each profile its own SimProxies line.
Get Undetectable.io ↗GoLogin
3 profiles come free, and it has Windows, macOS, Linux and phone versions. A SimProxies line pastes in as host:port:user:pass.
Get GoLogin ↗Partner links. Each antidetect browser that takes an HTTP or SOCKS5 proxy works with our lines, and we recommend these two.
Ready to start?
A real carrier SIM per line, eight live US metros, unlimited rotation. A SIM from $2 for two hours or $5 a day.