Undetectable.io With USA Mobile Proxies for Agencies

Agencies that run US accounts for several clients need two things kept apart: the browser identity and the network route. Undetectable.io handles the first. It is an antidetect browser for Windows and macOS in which every profile gets its own fingerprint, its own cookies and its own proxy. GlobalProxies handles the second with USA mobile proxies on real AT&T, T-Mobile and Verizon SIM cards that sit in modems, routers and phones we run ourselves. Put the two together and each client profile opens on a US carrier address that belongs to it alone. This guide covers the setup from the dashboard to a working profile, plus the habits that keep a growing roster of client accounts tidy.

Why agencies pair Undetectable.io with carrier IPs

A client account managed from an agency office usually trips over the same problem: dozens of logins from one network, one device and one set of browser traits. An antidetect browser splits the device side into separate profiles, but every profile still needs a route to the internet that matches the story it tells. A US account that connects from a hosting company's address range looks out of place no matter how carefully the fingerprint is built.

Mobile carrier addresses solve that side. The IPs on our lines are issued by AT&T, T-Mobile and Verizon to SIM cards, the same way they are issued to phones in the street. When an Undetectable.io profile routes through one of them, the site sees a US mobile subscriber rather than a server, and the fingerprint and the network finally agree with each other.

Choosing an Undetectable.io plan for a client roster

Undetectable.io has a free plan with up to 5 cloud profiles, which is enough to set up a pilot client and confirm the workflow before committing. Paid plans add more profiles and unlock proxy import, which saves a lot of typing once you are onboarding several clients at a time.

Profiles come in two kinds. Local profiles are stored on the machine where you create them, which suits a single operator who always works from one computer. Cloud profiles can be opened from other devices, which is what an agency usually wants when account managers swap shifts or work from different offices. On the bigger plans you can share profiles with team members, so the person covering a client on Friday opens the same profile, with the same proxy, as the person who ran it on Monday.

Collecting the proxy details from GlobalProxies

Each line in the GlobalProxies dashboard shows a host, an HTTP port, a SOCKS5 port, a username and a password, plus a rotation link. If you prefer not to use credentials you can whitelist your office IP instead, but for a team that works from several locations a username and password is far easier to manage.

Undetectable.io accepts HTTP and SOCKS5 proxies with a login and password, so either port will work. Pick one protocol per client and stick to it, which keeps your records simple when someone else has to troubleshoot a profile later.

Step-by-step: attaching a line to a client profile

Do the first client carefully and the rest of the roster goes quickly.

1. Open Undetectable.io and create a new profile, naming it after the client and the account it will run.
2. Go to the proxy settings of the profile and choose HTTP or SOCKS5 to match the port you copied.
3. Enter the GlobalProxies host, the port, the username and the password.
4. Run the proxy check and confirm the exit IP is in the United States on AT&T, T-Mobile or Verizon.
5. Let timezone, language and geolocation follow the proxy IP instead of setting them by hand.
6. Set WebRTC to use the proxy's IP so the browser never exposes your office connection.
7. Save the profile, open it, and sign in to the client account only after a location check page agrees with the proxy.

Sticky sessions, rotation and client logins

Client accounts stay signed in for long periods, and a login that jumps to a new address in the middle of a session is a reliable way to earn a verification prompt. GlobalProxies lines support sticky sessions, so a profile keeps its carrier IP for as long as the work takes.

When you do want a fresh address, use the rotation link or the API with the profile closed, then reopen the profile so it starts on the new IP. If the profile has a change IP URL field, paste the rotation link there so the right person can trigger it from the right place. Avoid scripts that rotate on a timer while account managers are still working.

Keeping a multi-client workspace organised

The mapping between clients, profiles and lines is where agency setups usually drift. A few rules stop it turning into guesswork.

• One line per profile, or per group of accounts that belong to the same client and are meant to look related.
• Name profiles with the client, the platform and the line, so anyone on the team can tell which proxy a profile uses without opening it.
• Keep each client's profiles on lines in the city where the client's business actually operates.
• Record which team members have access to each shared profile, and remove access when someone leaves the account.
• Re-run the proxy check on any profile that has been idle for a while before signing in.

Troubleshooting Undetectable.io proxy errors

Most agency support questions come down to one of these.

• Proxy check fails straight away: the port does not match the protocol, or the password picked up a space when it was copied. Paste the values again from the GlobalProxies dashboard.
• Check passes on one computer but not another: the line uses an IP whitelist and the second office has a different address. Switch the line to username and password, or add the new address.
• Location test shows the wrong state: timezone or geolocation was set by hand. Return them to follow the proxy IP and reopen the profile.
• Client account asks for verification right after a rotation: the line was rotated while the profile was still open. Close the profile first, rotate, then reopen.
• Pages feel slow: check whether the line is 4G or 5G. Our 4G lines typically run at 20–45 Mbps and 5G at 50+ Mbps, and a rotation between sessions can move the line onto a less busy cell.

Getting Undetectable.io for your agency

If your agency is starting fresh, the free plan is the simplest way to try this setup on one client before moving the rest of the roster across. GoLogin is the alternative we suggest when part of the team works on Linux or wants a phone app, and we cover it in a separate guide.

• Get Undetectable.io (partner link)

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