Undetectable.io With a Real US SIM Line

Undetectable.io is an antidetect browser: it keeps many browser profiles apart, each with its own fingerprint, its own cookies and its own proxy, so that each one appears to a website as a separate device. The proxy supplies the network half of each profile's identity, and a real US carrier SIM supplies the most ordinary network identity an American website can see. This guide shows where a Real US Proxies line goes inside Undetectable.io, how to use the browser's own check to see the carrier before the profile ever opens a site, which settings must agree with the SIM's city, and how to keep a screenshot that proves the setup.

What to copy from the line's card

Sign in at mine.realusproxies.com and open the line. The card prints the host, the HTTP port, the SOCKS5 port, the username and the password, plus the carrier and the city the SIM sits in. Copy the SOCKS5 details; SOCKS5 carries every kind of traffic and keeps DNS lookups inside the line. Leave the rotation link out of the profile; it is used only when you want a new address.

Storing the line in the proxy manager

Undetectable.io has a proxy manager where a line is saved once and attached to any number of profiles. Save the line there rather than typing it into each profile: a renewal or a city move then means one edit instead of many.

1. Open the proxy manager and press Add.
2. Choose SOCKS5 and enter the host, the SOCKS5 port, the username and the password, or paste socks5://user:pass@host:port.
3. Name the entry after the SIM's city and carrier, for example Miami AT&T.
4. Press Check and read the result: United States, the carrier, a city in the SIM's state.
5. Save.

Building the profile

The fingerprint is independent of the proxy, so pick the operating system and browser the account should appear to use. Attach the saved line, then set the three signals the site compares with the address: time zone, language and geolocation.

1. Create a new profile and name it after the account and the city.
2. Choose the fingerprint operating system; Windows or Android is usual for US consumer accounts.
3. In the Proxy section pick the saved Real US Proxies entry.
4. Set the time zone to follow the proxy, or by hand to the SIM's city: Eastern for New York, Boston, Miami and North Carolina, Central for Chicago and Houston, Mountain for Phoenix, Pacific for Los Angeles.
5. Set the language to en-US and geolocation to follow the proxy, then save and launch.

The screenshot that proves it

Inside the launched profile, open a public IP checker and take a screenshot. It should show a US carrier as the ISP, cellular as the connection type, the United States as the country and the SIM's state as the region, with the browser's time zone matching that state. Open a WebRTC test and confirm nothing but the carrier address appears. Keep the screenshot with the profile's name; if a platform ever questions the account, this is the evidence that the setup was consistent from the first day.

Rotation, moves and several profiles

Rotate with the profile closed, reopen it and it continues on the new address; the fingerprint does not change. After a free move to another city, edit the saved entry once and update the time zone. Several profiles can share one line, but they all show the same public address, so only profiles that belong to the same identity should do so. One account, one SIM, is the simplest rule and the one most of our customers follow.

Mistakes that undo a good setup

A correct proxy entry can still produce an unconvincing profile. The most common fault is a profile created before the SIM was attached, with a time zone already fixed to the buyer's own country; check that the zone really follows the proxy. The next is a saved entry that was edited after a city move while the profile's language or location prompt stayed behind. Another is sharing one SIM between accounts that are meant to look unrelated, which no fingerprint setting can repair, since every profile on that SIM shows the same public address. Finally, do not rotate while a logged-in session is open. Close the profile, rotate, look the new address up in a checker, then reopen it. A minute spent on this order of steps saves an awkward login challenge later on.

Frequently asked