AT&T dedicated mobile proxies: your modem, your SIM, nobody else on it

An AT&T plan from Dedicated Mobile Proxies is a modem, router or Android phone in one of our US facilities with an AT&T subscriber SIM inside it, assigned to you for the term you paid for. No other customer sends traffic through that device. This page is about the AT&T part specifically: what the address looks like from the outside, how the network behaves, where we keep AT&T hardware, the one geolocation oddity you should know about before you order, and the habits that keep an AT&T line quiet for a month.

How an AT&T address presents itself

Look up the address your modem holds and the owner is AT&T Mobility, announced under autonomous system AS20057. Every lookup service classifies that range as a cellular network. The same range is what an AT&T customer's phone shows when it is on mobile data, which is the whole reason the address is treated carefully by websites: a block on it would catch paying AT&T subscribers.

AT&T, like every US carrier, puts many subscribers behind each public address through carrier-grade NAT. The address your modem is using right now is also being used by phones nearby. What is exclusive is the modem and the SIM behind it. The requests leaving your modem are yours; the behaviour a website attributes to your session is your behaviour; and when the address changes it is because you asked, or because AT&T's gateway reset the session, not because a stranger pressed rotate.

Where the AT&T hardware is

We keep AT&T SIMs in devices in New York, Los Angeles, Chicago, Houston, Phoenix, Miami, North Carolina and Boston, on both 4G LTE and 5G. Stock varies by city and by device type, and the checkout shows what is available at the moment you order. AT&T's regional gateways mean the address usually geolocates to the metro the device is in, or at least to the state, in the common databases.

Boston is the exception. AT&T addresses assigned in Boston are announced from gateways that the geolocation databases place in New York, so a Boston AT&T modem reads as New York to most websites. If the Boston reading itself is what you need, order a Verizon or T-Mobile device there instead. If a New York reading is fine, the Boston AT&T device is simply another New York address with its own radio.

What AT&T's network does with your session

AT&T holds a data session open for as long as the device keeps it alive, so a sticky address on an AT&T modem can last many hours or days. When you request a rotation, the modem drops its session and registers again, and the gateway assigns a new address from the regional pool. The pool is finite, so over a day of frequent rotations you will see repeats; that is how carriers work and not something we or anyone else can change.

Speed is a function of the tower, the band and the hour. 4G lines usually run 20 to 45 Mbps and 5G 50 Mbps and up. Evenings in dense metros are slower than mornings because the same towers carry commuters' phones. If you need headroom, choose 5G at checkout.

Habits that keep an AT&T line quiet

Decide at the start whether a line is sticky or rotating, and keep to it. Account work, anything signed in, belongs on a sticky line where the address is left alone from sign-in to sign-out. Monitoring and research can rotate between batches. Mixing the two on one modem, so that a signed-in session suddenly arrives from a new address, is the mistake that causes verification prompts.

Match the rest of the profile to the modem. A browser profile on a Houston AT&T line should carry a Central time zone, US English and a mobile or desktop fingerprint that is consistent from day to day. The address is the strongest signal a site sees, but it is not the only one, and a mismatch between address and time zone is cheap for a site to notice.

Ordering an AT&T line

Pick the city, pick AT&T, pick a 4G or 5G device type, and pick a term. Hourly test blocks are $2 on 4G and $3 on 5G for the first two hours. Daily plans are $5 and $6, weekly $28 and $31, monthly $69 and $79, all with unlimited data. The dashboard at desk.dedicatedmobileproxies.com shows the host, ports and credentials within moments of payment. If the AT&T reading in your city turns out not to suit the sites you use, move the device to another city for free, swap to another carrier with a new order, or cancel within 24 hours for a full refund.

AT&T proxy questions