Undetectable.io Setup With a US Mobile Proxy

Undetectable.io is an antidetect browser: a program that runs many separate browser profiles, each with its own fingerprint, cookies and proxy, so that each profile appears to a website as a different device. A US mobile proxy supplies the network half of that identity. This guide states exactly where a Mobile Proxy USA line goes inside Undetectable.io, which settings must agree with the SIM's city, and how to confirm that the profile is actually leaving through the carrier address before it is used for anything. The steps apply to the Windows and Mac versions and to both local and cloud profiles.

What you need from the dashboard

Sign in at area.mobileproxyusa.com and open the line. The card shows a host, an HTTP port, a SOCKS5 port, a username and a password, plus the rotation link. Undetectable.io accepts both HTTP and SOCKS5; SOCKS5 is the usual choice because it also carries UDP and does not depend on the browser's HTTP proxy handling. Keep the rotation link separate from the profile, since it is only needed when a new address is wanted.

Creating the profile and adding the proxy

Undetectable.io lets a proxy be saved once in its proxy manager and reused by any profile, or typed directly into a profile. Saving it in the manager is better for a line that will serve one profile for a month, because a renewal or a city move only has to be updated in one place.

1. Open Undetectable.io and choose New Profile. Give it a name that includes the SIM's city and carrier, for example Houston T-Mobile.
2. Pick the operating system and browser the account should appear to use. For most US consumer accounts a Windows or Android fingerprint is the common case.
3. In the Proxy section choose SOCKS5, then enter the host, the SOCKS5 port, the username and the password from the dashboard card. Alternatively paste a single line in the form socks5://user:pass@host:port.
4. Press Check. The result should name the carrier, the country as United States and a city in the SIM's state. If it fails, re-copy the credentials and confirm the plan is active.
5. Set Time zone to be taken from the proxy, or set it manually to the SIM's zone: Eastern for New York, Boston, Miami and North Carolina; Central for Chicago and Houston; Mountain for Phoenix; Pacific for Los Angeles.
6. Set Language to en-US and Geolocation to follow the proxy, then save and launch.

Checks before the profile is used

Launch the profile and open an IP lookup page. It should show a US carrier as the organisation and a connection type of cellular or mobile. Then open a WebRTC leak test; the only addresses listed should be the carrier address or none at all. Finally compare the clock in the profile with the clock of the SIM's city. A profile whose address says Phoenix and whose time zone says Berlin is the most common avoidable mistake.

Undetectable.io's fingerprint does not depend on the proxy, so a line can be rotated or even moved to another city without rebuilding the profile. After a move, update the host and port in the proxy manager and run Check again.

Why the proxy and the fingerprint must agree

Undetectable.io controls what the browser reports about itself: screen size, fonts, canvas and audio hashes, platform and user agent. The proxy controls what the network reports: carrier, country, city and time offset implied by the address. A website compares the two. A mobile carrier address paired with an Android fingerprint is the most natural combination, because that is what the carrier's own subscribers look like. A carrier address paired with a desktop Windows fingerprint is also ordinary, since laptops tether to phones and home routers run on cellular plans. What looks wrong is a mismatch in region: a Houston address with a European keyboard layout, a non-US locale, or a clock that is five hours off. Setting time zone, language and geolocation to follow the proxy removes all three mismatches at once.

One line, one profile, or several?

A dedicated line carries only your traffic, so the question is how many identities should share one carrier address. For accounts that must look unrelated, use one line per profile, because two profiles on one address at the same time are visibly linked at the network level. For profiles that belong together, for example a brand's main page and its support account, one line is fine. Mobile Proxy USA sells each line separately at $5 per day, $28 per week or $65 per month on 4G and $6, $31 or $75 on 5G, so a profile-per-line layout is priced per identity.

Rotation should be used between sessions, not during one. Rotating while a profile is logged in changes the address mid-session, which is exactly the signal a platform watches for. Close the profile, trigger the rotation link, wait for the new address, then open the profile again.

Cloud profiles and teams

Undetectable.io can store profiles in its cloud so that a team member on another computer opens the same profile. The proxy settings travel with the profile, so the second person leaves through the same Mobile Proxy USA line from wherever they are. The line itself allows several simultaneous connections within its connection limit, which covers a profile plus an occasional script. Keep a shared note of which profile uses which line and when the line renews, so nobody opens an account on the wrong city.

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