How Agencies Split Mobile Proxy Lines Across Clients and Cities

An agency does not have one job; it has a dozen clients with overlapping needs in different cities. The question we hear most from agencies is not whether to use mobile proxy lines but how to lay them out so that nothing from one client ever touches another client's work. This article describes the layout most agencies settle on with Mobile Proxies USA: one line per client, in the metro that matters to that client, plus a small set of general lines for the agency's own checks.

The one-client-one-line rule

The rule is simple to state: every client gets at least one line that nothing else uses. Their accounts, their verification checks and their local searches all exit through that one carrier address, and the address belongs to that client's work for the whole term. If the client leaves, the line is retired or re-labelled; it is not quietly handed to the next client while still holding cookies and sessions from the last one.

The rule exists because the alternative is messy in a way that is hard to see until it bites. Two clients sharing a line means two sets of logins seen from one address, two sets of behaviour patterns on one SIM, and one rotation affecting both at once. With separate lines, a problem on one client's account stays on that client's row.

Place each line in the client's metro

We run eight metros: New York, Los Angeles, Chicago, Houston, Phoenix, Miami, Boston and North Carolina. A client who sells in Houston should exit from Houston, so that local search results, local pricing and local ad inventory read as a Houston resident would see them. A national client can sit in whichever metro has the carrier you prefer in stock.

Geolocation is reliable at state and country level on all three carriers. T-Mobile tends to show the metro itself most consistently; Verizon can resolve to a regional hub within the region; and there is one well-known quirk: AT&T lines in Boston geolocate as New York, while Verizon lines in Boston read as Boston. If a client's work is city-sensitive, pick the carrier with that in mind, and remember that a free move can relocate the line later without buying a new one.

A sample layout for a mid-size agency

Here is a layout that works for an agency with eight clients and three staff. It is not the only layout; it is the one that stays readable at a glance in the dashboard and in the team's profile browser.

• Eight client lines, monthly, each labelled client, metro, carrier, purpose; auto-renew on.
• Two general 5G lines in New York and Los Angeles for the agency's own checks and audits, monthly.
• A floating budget for daily or weekly lines when a client runs a short regional campaign in a city not covered above.
• One hourly line now and then for a quick look from a metro the agency does not normally hold.

Access: who holds which credentials

Agencies usually run a profile browser such as Undetectable.io or GoLogin with team workspaces. The pattern that works is one workspace or folder per client, one proxy entry per line inside it, and staff invited only to the workspaces of the clients they handle. The dashboard login stays with the account owner and one deputy. Staff never need the dashboard; they need the profiles.

When a staff member leaves, remove them from the workspaces and reset the credentials of the lines they touched from the dashboard rows. Both steps take minutes. Because each line is separate, the reset does not interrupt any other client.

Billing a line through to a client

Every line costs the list price: 4G at $5 a day, $27 a week or $64 a month, and 5G at $6 a day, $31 a week or $74 a month. There is no special agency rate, which is actually convenient when you pass the cost through, because the figure on your invoice to the client is the figure on ours. The dashboard records each purchase and renewal per row, so you can export a client's line history without picking it out of a lump sum.

If a client's engagement ends mid-term, unused whole units of time on their line are returned as a prorated credit to your balance when you remove it. That credit goes toward the next client's line. Within the first 24 hours of a daily, weekly or monthly plan, a full refund to the original payment method is available on request.

Campaign lines and when to add them

A client running a two-week regional push in Phoenix does not need a permanent Phoenix line. Buy a weekly line twice, or a daily line for the exact days, label it with the campaign name, and let it expire. The alternative, moving the client's permanent line to Phoenix and back, also works and is free, but it interrupts whatever the permanent line was doing. Most agencies prefer the extra short line because it keeps the client's main sessions untouched.

For a quick spot check from a metro you do not hold, the hourly option costs $2 for the first two hours on 4G or $3 on 5G, then the same per additional hour, up to four hours per purchase. It never auto-renews, and if the check turns into a day of work, the hours paid count toward the one-day plan.

Reporting to the client

Clients increasingly ask where their checks were run from. The honest answer is specific: a dedicated AT&T, T-Mobile or Verizon line in a named metro, used only for their account, with the address rotating when your process rotates it. Keep a short note per line with the carrier, metro and the date range it served the client; it is the kind of detail that makes an agency look organised, because it is.

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