Mobile Carriers Know Everything—Here’s How to Limit What They Share

Photographer: appshunter.io | Source: Unsplash

​Who’s Listening to Your Phone? (Hint: More Than You Think)

Your phone knows a lot about you. Not just the obvious stuff — your contacts, your recent photos, the apps you use — but also details you probably assumed were more private: where you live, how often you go to the gym, even pieces of your financial life. And the company that usually holds that map of your habits? Your mobile carrier. AT&T, T‑Mobile, Verizon — the big three — collect and share more data than most people realize. Here’s what they gather, why it matters, and what you can do about it.

What they collect (spoiler: it’s a lot)
Carriers log the usual identification details: your name, home address, email, date of birth — the information you provide when you sign up. But it goes further. In some cases, that includes Social Security numbers, driver’s license or passport numbers used for identity verification. They also keep records of your location history, billing and credit information, and metadata about your calls and texts. In certain circumstances, browsing and search histories can be tied back to you, too.

Think of it like a nosy roommate who not only watches what you do but writes it all down and then invites advertisers to look through the notebook.

Why they collect it — and what “for service” often means
You’ll hear carriers say this is for “service improvement,” fraud prevention, and security. And that’s partly true: location and usage data help route calls, manage network capacity, and detect unusual activity. But the same data is extremely valuable to advertisers. Aggregated and sold to third parties, it helps create detailed profiles that make ads feel uncannily targeted. That “you might like artisanal pickles” ad isn’t prophecy — it’s profiling.

Who gets your data
Carriers sometimes share customer information with ad networks, analytics firms, and other third parties. These partners range from well-known marketing companies to niche data brokers you’ve never heard of, many of whom collect, combine, and resell profiles across the web. The result: your behavior on the phone becomes part of a commercial data chain that you rarely see and rarely consent to in any meaningful sense.

Photographer: NSYS Group | Source: Unsplash

Practical steps you can take — yes, you actually can do something
Don’t panic. You have tools to reduce exposure.

• Read your carrier’s privacy settings. I know — boring. But it matters. Look for labels such as “Share or sell my personal information,” “Personalized advertising,” “Analytics,” or “Business and Marketing Insights,” and turn off sharing where possible.
• Account pages vary. For AT&T, find “Share or sell my personal information” or “Personalized” toggles. In T‑Mobile’s dashboard, look for the “Do not sell or share my personal information” opt-out and review Advertising and Analytics settings. Verizon customers should look for options to disable programs like “Custom Experience” or any marketing/analytics settings tied to “Business and Marketing Insights.”
• Device-level protections. Limit app permissions, disable location services for apps that don’t need them, and turn off unnecessary background tracking. These won’t stop carrier-side collection, but they reduce the picture advertisers can build.
• Consider privacy tools. A reputable VPN helps obscure some of your network traffic from third-party observers (not a cure-all), and privacy-focused browsers can reduce cross-site tracking.

Know your rights — and their limits.
Depending on where you live, laws like CCPA/CPRA and other regulations give you the right to opt out of selling or sharing personal information and to request access to data held about you. But the effectiveness of these protections varies. Opting out will reduce third-party sharing and targeted ads. However, carriers still need specific data to provide basic service — billing, routing, and security-related info can’t be fully turned off.

Why this matters beyond annoying ads
Data breaches and misuse have real consequences. Significant carrier breaches in recent years exposed millions of customers’ data, leading to identity theft, credit freezes, and hours (or days) spent repairing damage. Even if you never click on a sketchy link, your details can be assembled and weaponized by bad actors or used in ways you never expected.

The small acts of rebellion that add up
The takeaway: your carrier knows a lot, but you have options. Please read the privacy policy (yes, read it), flip the toggles you find, opt out where possible, and lock down your device-level settings. Those aren’t ironclad shields, but they’re meaningful steps that reduce the amount of data that ends up in other companies’ hands.

Privacy isn’t a single switch you can flip and forget. It’s a series of small choices — each toggle you turn off, each permission you deny — that together make it harder for companies and data brokers to build a complete picture of your life. And if nothing else, enjoy the tiny, guilty pleasure of logging in and switching “Share my data” to “Off.” It feels a little bit like closing a window you didn’t know was open.

If this raised questions about specific settings for your carrier or your account dashboard, please tell me which provider you use, and I’ll walk you through the most likely places to find the relevant toggles.