Nine days ago someone on r/proxies described a problem half the proxy market is quietly built on: "I'm dabbling in running an ecommerce monitoring tool for reselling. Checking stock and price changes across a bunch of sites all day. Datacenter ips get flagged almost instantly now. I'm turning to mobile proxies since carrier ips supposedly don't get flagged."
The reasoning is sound. The conclusion is expensive. And for that specific job it is wrong, which is worth spelling out properly, because the same arc repeats in thread after thread: datacenter IPs stop working, mobile promises carrier-grade trust, the price wall appears, and people start eyeing request-capped budget plans or a drawer full of SIM cards. Four people asked four versions of this recently, and together their questions map the territory better than any product page.
Why carrier IPs get treated so gently
Carrier IPs carry unusual trust because of CGNAT, carrier-grade NAT, which puts hundreds or sometimes thousands of real phone subscribers behind one public IPv4 address, so any site that blocks the address locks out real customers along with you.
Mobile carriers own far fewer public IPv4 addresses than they have phones. So they pool. Your phone gets a private address internally, and its traffic reaches the internet through a shared gateway IP that also carries a small town's worth of other subscribers. From the target site's side, that one address is a crowd of legitimate users on real devices, some of them logged-in paying customers, browsing right now.
Blocking it is self-harm. So platforms mostly don't. They rate-limit softly, tolerate more weirdness, and any abuse signal from one user drowns in the noise of everyone else. There is a second effect people miss: reputation cannot stick to you. When your device reconnects, it surfaces on a different gateway address, and the one you left behind immediately fronts a different crowd. Yesterday's abuse does not follow the IP, and the IP's history does not follow you.
That is the machinery behind "carrier ips supposedly don't get flagged". The supposedly is doing less work than usual. It is mostly true.
Why that trust costs real money
Mobile proxy bandwidth is expensive because every gigabyte crosses a metered carrier data plan running on physical hardware: a phone, an LTE dongle, or a modem bank with a SIM card in every slot.
Residential traffic piggybacks on flat-rate home connections. Mobile traffic does not. Someone pays a carrier for the data plan in every modem, plus the modem itself, power, a host machine, and the labor of swapping SIMs when a carrier decides a line looks off. Divide those costs by the gigabytes one 4G modem can realistically push in a month and the per-GB price explains itself.
That is the honest answer to everyone who feels mobile pricing was set for a Fortune 500 procurement department. Nobody is gouging you, or not only. The inputs cost more, and a provider selling mobile at residential prices is usually selling residential with a different label. More on that below.
When you need mobile, and when you are overpaying
You need mobile proxies when the trust of a single IP decides the outcome of a single sensitive action, and you are overpaying whenever the job is bulk requests.
The stock checker from r/proxies is the clearest case. Polling prices and stock across many sites all day is a volume workload: thousands of boring GET requests where no login, no signup, and no account is at stake. Rotating residential proxies handle that at a fraction of mobile's per-GB price, and the right response to datacenter IPs getting flagged is to step up one tier, not two. That person does not need mobile proxies. That is probably the most useful sentence here.
Mobile earns its price where IP trust is the whole game: account creation on the hardest social platforms, signups inside mobile apps (where a datacenter exit is a glaring mismatch for a device claiming to be a phone), warming fresh accounts through their fragile first days, and any action where one flagged request costs an asset you spent weeks building. Ten requests that must succeed, not ten million that mostly should.
Which reframes the r/automation question, "What is your recommendation between these three?", asked about "oxylabds, brightdata and proxidize" (spelling theirs). Between-these-three is the second question. The first is what the workload looks like, because answering it often deletes the second.
What a 100-request cap actually buys
A mobile plan capped at 100 requests only makes sense for account actions, because any scraping or monitoring workload burns through 100 requests in minutes.
A thread on BlackHatWorld asks it straight: "Has anyone used mobile proxies with a 100-request traffic limit?" Arithmetic answers most of it. A modern product page fires dozens of network requests before it settles; open devtools on any shop and watch the counter climb. Call one page one request only if you make raw HTTP calls to a single endpoint. Even then, a monitor checking 200 SKUs every 10 minutes makes 28,800 checks a day, which is 20 per minute. A 100-request cap covers five minutes of that.
Flip it around and the cap looks different. Logging in, posting once, updating a profile: single-digit requests per session. For a warming rotation where each account does a handful of actions daily through a trusted carrier IP, 100 requests is a day's allowance, not an insult. Capped plans are not a scam. They are a fence around the only use case the price makes sense for.
The DIY route: hotspots, dongles, and airplane mode
A DIY mobile proxy is a phone or LTE dongle with a data SIM, sharing its connection to a small proxy server that exposes each line as a connectable HTTP or SOCKS5 endpoint on its own port.
People genuinely build these. One r/privacy user described the goal precisely while not yet knowing the vocabulary for it: "I want to be able to connect different mobile phone hotspots to different firefox windows." That is a multi-line mobile proxy farm, expressed as a browser problem.
The pieces are unglamorous. One SIM with a data plan per line. One hotspot-capable device per SIM, or a multi-slot modem bank. A machine running proxy software bound to each connection separately, so port 10001 exits through line one and port 10002 through line two. Rotation comes free with the physics: toggle airplane mode, the device reattaches, and the carrier hands it a different gateway IP. Some farms script that toggle over ADB across a shelf of old Android phones.
It works. For two or three lines in a country you live in, it can beat renting. Then it stops making sense fast: every line bills monthly used or not, every device is a failure point, all your IPs sit on one carrier in one city, and the hours spent nursing modems get billed against whatever the proxies were for. Past a handful of lines you have not saved money, you have founded a small unprofitable telecom.
How to judge a provider without a best-of list
You can evaluate any mobile proxy provider with four checks: whether exit IPs really belong to carrier networks, how much rotation control you get, whether pricing is per GB or per port, and whether your countries are actually in the pool.
Look up the ASN of the exit IP
The ASN check catches the worst offense in this market, relabeled residential. Pull an exit IP and look up which network announces it. It should belong to a mobile carrier, Vodafone or T-Mobile or their local equivalents, not a hosting company or a cable ISP. Repeat across a few sessions. A "mobile" pool that keeps surfacing broadband addresses has answered your question.
Demand rotation control, not pool bragging
Rotation control means the IP holds still for a session and changes when you say so, on demand or on a timer you set, not whenever the pool feels like it. For account work this matters more than any pool-size number, because an IP change mid-session is itself a signal.
Per GB or per port, know which you are buying
Per-port pricing rents a dedicated modem: expensive, predictable, all its bandwidth yours. Per-GB pricing shares the modem bank and meters traffic, which suits lighter or bursty use. BirdProxies sits in the second camp, selling 4G and 5G mobile traffic per GB with country targeting for Germany, the UK, the US, and Japan. Neither model is wrong. Paying per port to send a few hundred requests a day is overbuying, and hammering a shared pool with a scraper is the mistake this whole piece is about.
Read the country list with suspicion
A provider can only offer carrier IPs where it operates hardware and SIMs, which is why honest mobile coverage lists are short. A mobile provider advertising 190 countries deserves the ASN check twice.
The four questions share one answer in the end. Mobile proxies are the most trusted addresses money can buy because real people stand behind every one, and that is exactly why they cost what they cost. Buy them for the moments where that trust decides something. Everything else has cheaper tiers, and the cheaper tiers are usually enough.