Undetectable.io on an American Carrier SIM: Setup From Abroad

Undetectable.io is the antidetect browser we recommend first. It runs on Windows and Mac, each profile has its own fingerprint and its own proxy, and there is a free plan that is enough to test the pairing with one of our lines. This guide shows how to put an American carrier SIM into an Undetectable.io profile. It is written for a buyer who sits far from the United States, so the time zone and language settings get extra attention. The referral link we use is https://undetectable.io/?r=9IEdw.

Why an antidetect browser and a carrier SIM belong together

A proxy changes your network address. It does not change your browser. If your browser reports a Vietnamese time zone, a Chinese system language and a screen that belongs to your own laptop, the website sees an American mobile address with a foreign device behind it. Undetectable.io gives each profile a separate device identity, so the browser can match the SIM.

The other half of the pair is the SIM itself. Our lines are real Verizon, AT&T and T-Mobile SIMs in hardware we own in eight American cities. One SIM serves one customer. The address is shared with many real phones through the carrier's NAT, which is why websites trust it. The profile and the SIM together look like one American phone user.

What you need from the dashboard

Sign in at space.americanmobileproxies.com and open your line. You will see a host, an HTTP port, a SOCKS5 port, a username and a password. Copy them somewhere safe. Also note the city of the SIM, because you will type that city's time zone into the profile. If the SIM is in Los Angeles the time zone is America/Los_Angeles; Chicago and Houston are America/Chicago; Phoenix is America/Phoenix; the East Coast cities are America/New_York.

Setting up the profile

Install Undetectable.io from the link above and create an account. The steps below create one profile on one SIM.

1. Click New profile and choose the operating system the account should appear to use. Windows is the safest default.
2. Open the Proxy section of the profile. Choose HTTP or SOCKS5, then paste the host, the matching port, the username and the password from the dashboard.
3. Press the check button. It should report an American carrier and the city or state of the SIM.
4. Set the time zone to the SIM's city. Set the language to en-US. Set geolocation to follow the proxy or to the SIM's city.
5. Save and start the profile. Load an IP check page and confirm the address before you sign in to anything.

Settings that matter for a buyer in Asia

The time zone is the most common mistake. Your computer clock is in your own country, and some tools copy it into the profile. Set the profile to the SIM's city by hand and check it on a browser fingerprint test page. The language should be English (United States), even if you read the site in Chinese. WebRTC should be disabled or set to replace the address, otherwise the website can learn your real local address.

Fonts and screen size are set by Undetectable.io itself. Leave them alone. The last thing is behaviour: work during American daytime when you can. A profile that logs in every day at 3 in the morning Chicago time looks like a night-shift user. That is not a problem on its own, but a daytime routine looks more ordinary.

One profile per SIM

Two profiles on one SIM appear to websites from the same address at the same time. If the two profiles are two accounts that should look unrelated, that defeats the purpose. Keep one profile per SIM, and keep the pair together for the whole term. If you need five identities, rent five lines, and spread them across cities and carriers if the accounts should look like different people in different places.

Rotation should happen between sessions, not during one. Close the profile, rotate the SIM from the dashboard or the link, wait a few seconds, then open the profile again. The new address is still the same carrier in the same city, so the profile's time zone does not change.

When something does not connect

If the proxy check fails, first confirm the port matches the protocol you chose. The HTTP port and the SOCKS5 port are different numbers. Then confirm the username and password have no extra space. If the check passes but pages do not load, the line may be rotating; wait ten seconds and try again. If your own network blocks proxy ports, use the VLESS link from the dashboard with a local client, and point the profile at the local port.

Support answers by email at [email protected] and through the Telegram bot, 24 hours a day. Send the line name, the city and what the check showed. Our website is also available in 简体中文 and Tiếng Việt, and you can write to us in those languages.

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