Two checks we do before a customer gets a SIM, and anyone can use them. No sign-up, nothing stored.
What IP am I on? City, carrier, ASN, WebRTC leak and time-zone match, all seen at once.
Free toolProxy checkerPaste in a single proxy or a full list (HTTP, HTTPS, SOCKS4, SOCKS5) to see latency, ISP, location and exit IP for each line, then export those that work.
Free downloadProxy Tester appDesktop app for Windows, macOS and Linux.
Which antidetect browser should I use with a real SIM line? Undetectable.io first. Give each profile its own SIM line, let the time zone follow the proxy, and run its built-in check so the carrier shows before launch. GoLogin is our second recommendation; both offer free plans.
Start on the free plan; runs on macOS and Windows, with cloud and local profiles. Give each profile its own Real US Proxies line.
Get Undetectable.io ↗3 profiles on the free plan; Linux, macOS and Windows, and apps for phones too. Paste a Real US Proxies line as host:port:user:pass.
Get GoLogin ↗Partner links. Our SIMs work with any antidetect browser that accepts an HTTP or SOCKS5 proxy; we recommend these two.
To test DNS and WebRTC leaks, bot detection and browser fingerprinting, we send customers to IPFighter's free suite, a good match for a Real US Proxies SIM:
IP score & lookup ↗ Browser fingerprint ↗ Bot detection ↗ DNS leak test ↗ WebRTC leak test ↗ IPFighter proxy checker ↗
Real carrier SIMs live in eight US metros, and rotation is unlimited. A real SIM: $2 for two hours, $5 for a day.