How We Run a Mobile Proxy Rack in Chicago

People ask what is actually behind the host and port they buy from us, so here is the honest version. Chicago Proxies is a rack of cellular hardware in Chicago, loaded with carrier SIMs, with a small team keeping it online. There is no clever pool, no app that borrows bandwidth from strangers' phones, no reselling of somebody else's lines. This article walks through the hardware, the rule that one SIM serves one customer, the carriers we stock, how rotation is done, and what happens when you move a plan to another of our cities.

What is on the shelves

The rack holds three kinds of device. 4G and 5G USB modems, which are the workhorses: small, cheap to run, and easy to swap when one fails. Cellular routers, which carry a SIM the same way but have their own power and management. And Android phones, which are the most phone-like of the three because they are phones. Each device holds exactly one SIM from AT&T, T-Mobile or Verizon, registers on the carrier network like any handset, and gets a public address from the carrier's Chicago-area gateway.

Behind the devices sits ordinary server hardware that turns each cellular connection into an HTTP(S) and a SOCKS5 endpoint with a login, keeps the connection up, handles rotation requests, and talks to the dashboard. Everything is on wired power with battery backup and on a wired uplink for management. The actual customer traffic leaves over the air, through the carrier, which is the whole point.

We own all of it. The SIMs are on our accounts, the modems and phones were bought by us, and the rack is ours. When something breaks, we replace it, which is why a fault on a line is our problem to fix and not a ticket into somebody else's queue.

One SIM, one device, one customer

The rule we do not bend is that a SIM lives in one device and that device is rented to one customer at a time. When you buy a Chicago line, nobody else is on it for the length of your plan. You get the full bandwidth of that modem, and the address history it builds is your own. If a site rate-limits the address because of your traffic, that is something you can see and fix; nobody else can burn it for you.

This is different from a shared pool, where a provider puts many customers through the same handful of SIMs and lets them collide. Pools are cheaper per address and fine for some scraping, but they are poor for anything that has to look like one person over days or weeks. A dedicated line costs more because the hardware is yours while you have it, and we think that is the right trade for account work, long sessions and local checks that have to be repeatable.

Dedicated does not mean the public address is private. Carriers put many subscribers behind one address, so the address you use is also being used by phones on the same gateway. That sharing is the carrier's doing and is part of why the address looks like a phone.

Three carriers, stock that moves

We stock AT&T, T-Mobile and Verizon SIMs in Chicago. All three run 4G LTE and 5G in the city, and all three resolve to Chicago, Illinois on the usual databases. Which one is best depends on what you need: some sites and some apps treat one carrier a little differently from another, and the only way to know is to try. Many customers simply pick whatever is free, test it against their target for an hour, and keep it if it behaves.

Stock per carrier changes day to day. Lines come free when plans end and go when they are bought, and we add hardware as demand grows. The checkout page shows what is available right now, by carrier and by 4G or 5G, and that page is the truth; if a carrier is sold out today, it may be back tomorrow. Plans run from $2 for 2 hours or $5/day up to a month, so you can try a carrier for an afternoon before committing.

• 4G lines usually run 20–45 Mbps; 5G lines run 50+ Mbps.
• Hourly: $2 (4G) or $3 (5G) for the first 2 hours, then the same per extra hour up to 4; never auto-renews; hours paid count toward the day plan.
• Daily $5 / $6, weekly $28 / $31, monthly $65 / $75.
• Data is unlimited for proxy work; bulk file transfer is not what a consumer SIM is for.

How rotation works on the rack

Every line is sticky by default: you keep the address for as long as the carrier keeps the session, which can be hours or days. When you want a new address, you ask for one, and the device drops its data session and re-registers. The carrier then hands it another address from the same regional pool. You can trigger this from the dashboard, from a rotation link you can call from any script, from the API, or on a timer you set.

There is no wait between rotations and no limit on how many you do. The new address comes from the same Chicago-area pool, so it may be one you have had before; carriers reuse addresses constantly and that is normal. If you need a specific address to go away for a particular site, rotate and check, and rotate again if you got the same one back.

The carrier can also change the address on its own, usually after a long idle or during network maintenance. That is rare on a busy line but it happens, and it is one reason to read the address at the start of a session rather than assume.

Moving a plan to another city

Every plan can be moved, for free, to any of our other US cities from the dashboard. The remaining time carries over and nothing is charged. A move means your login is re-pointed to a free device in the other city on the carrier you chose if one is available, and you get that city's address instead of Chicago's. Moving back is the same operation. If the other city has no free line on your carrier, the dashboard says so.

We mention this because a Chicago line is not a trap. If your work turns out to need a different metro for a week, you move, and when it needs Chicago again, you move back.

Keeping it running

The rack is watched around the clock. Each line is checked for reachability, for whether the carrier session is up, and for whether rotation is responding, and anything that fails gets a person looking at it. Some faults clear with a device reboot that happens automatically; others need a hand on the hardware, which is why the rack is in a place we can get to.

Support is human, 24/7, by email at [email protected] and through @ChicagoProxiesBot on Telegram. If your line is misbehaving, tell us the order id and what you are seeing. If the fault is ours and we cannot fix it, unused time is credited. Payments are by card, PayPal, Bitcoin, USDT, Ethereum, Zelle or bank wire, and the line is live the moment payment clears.

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