AT&T mobile proxies on a Los Angeles line
An AT&T line from California Proxies is one AT&T SIM in one modem, router or phone that we run in our Los Angeles rack, rented to one customer at a time. Websites see AT&T Mobility, a Southern California address and a mobile connection, because that's exactly what it is. This page walks through what shows up on the far end, how 4G and 5G differ on AT&T here, how rotation works, and who tends to pick this carrier.
What a website sees when you connect
Every request that leaves an AT&T line carries an address from AT&T's wireless pool, announced under AS20057, the autonomous system registered to AT&T Mobility. IP intelligence services label it as mobile or cellular, name the ISP as AT&T Wireless or AT&T Mobility, and tag the connection type as a phone network rather than a home broadband or hosting range. There's no proxy header, no datacenter fingerprint and no VPN flag, because nothing on the path is a datacenter.
Geolocation is the part people ask about most. AT&T allocates its wireless addresses regionally, and the Los Angeles pool reads as Los Angeles or a nearby SoCal city in the common databases, with the state always resolving to California. A site that checks for a California visitor sees one. A site that wants a specific street address won't get it from any mobile carrier, because carrier-grade NAT places thousands of real phones behind the same public address.
That shared pool is a feature, not a flaw. Your address is the same kind of address a few thousand people on the Westside or in the Valley are using right now to scroll, shop and stream. Sites that score traffic by reputation are looking at a block of ordinary consumer usage with your sessions mixed in.
4G or 5G on AT&T in LA
AT&T runs both LTE and 5G across the LA basin, and the rack picks up both. A 4G line typically lands in the 20–45 Mbps range, which covers browsing, account work, ad verification and API traffic without anyone noticing a difference from a wired connection. A 5G line typically delivers 50+ Mbps and feels snappier on heavy pages and app testing, with the same address pool and the same carrier identity.
Pricing follows the radio: 4G is $5 a day, $28 a week or $65 a month, and 5G is $6, $31 or $75. Hourly blocks start at $2 for two hours on 4G and $3 on 5G, run up to four hours, and the hours you've paid count toward a day plan if you decide to stay. Pick 4G when the job is steady and modest, 5G when speed is part of the job.
Rotation on an AT&T line
Left alone, an AT&T session is sticky. The carrier keeps the same public address for as long as it keeps the data session up, which can be hours or longer depending on tower load and the modem's own behavior. That's the mode most account work wants: one address for one sitting.
When you need a new address, ask for one. The dashboard has a rotate button, every line has a rotation link you can hit from a script, the API exposes the same call, and you can set a timer so the line re-registers on a schedule you choose. Each rotation drops the data session and brings it back, and AT&T hands out an address from the same regional pool. It can be a fresh one or one the line has held before, because the pool is finite and the carrier decides. There's no limit on how many times you rotate.
Who tends to pick AT&T
Teams verifying ads and placements as a Los Angeles viewer, because AT&T is one of the big three consumer networks in the market and ad platforms treat it as plain mobile traffic. Agencies managing social and creator accounts for LA-based clients, where IP, time zone and language all need to say California together. App and QA teams who need to see what the AT&T network does to their product, including carrier-side differences a datacenter range would never reproduce. Scrapers and price checkers who want a mobile reputation and a steady address rather than a pool that changes under them.
Stock in the Los Angeles rack
We keep AT&T SIMs in both 4G and 5G hardware in LA, but the number free at any moment changes as customers start and end plans. Checkout shows what's available right now, and if AT&T is sold out on the tier you want you can take T-Mobile or Verizon instead, or reserve a slot and let the balance fill it when one frees up. Moving a plan between carriers or cities is free from the dashboard and the remaining time carries over.
AT&T proxy questions
Does the AT&T address read as Los Angeles specifically?
It reads as Los Angeles or a nearby Southern California city depending on which database the site uses, and as California in all of them. Mobile carriers never resolve to a street or a ZIP.
Can I keep the same AT&T address for days?
Usually, yes. The address stays until the carrier ends the data session or you rotate. We can't promise a fixed duration because the carrier controls it.
Is the AT&T SIM shared with anyone else?
No. One SIM, one device, one customer. The public address is shared with real phone subscribers by the carrier's design, but the SIM and the line are yours alone.