Somewhere in the last few years, a quiet shift happened. Apps that used to let you sign up with just an email now increasingly require a phone number: food delivery, retail, social platforms, banking tools, even loyalty programs and newsletters. In a lot of cases, it's no longer optional.

It's easy to write this off as a small convenience tradeoff. But it's worth asking the obvious question: why does everyone suddenly need your phone number?

Why Apps Actually Want It

There are legitimate reasons behind the request:

• Security and verification. Phone numbers are the backbone of most two-factor authentication and account recovery flows.
• Fraud prevention. A phone number makes it harder to spin up fake accounts or automate bot signups.
• Customer communication. SMS is a reliable channel for delivery updates, alerts, and marketing.
• Identity linking. Phone numbers double as a "unique identifier" companies can use to tie your activity together across their own systems.

That's the story companies tell — and it's mostly true. But there's a second, less visible layer to why phone numbers have become so valuable.

Your Phone Number Is a Universal Identifier

Unlike passwords or even email addresses, phone numbers tend to stick around. They stay the same for years, get tied to identity records, show up in multiple databases, and get reused across services you never think about again.

That stability is exactly what makes them valuable in the broader data ecosystem. The FTC's own study of the data broker industry found that brokers collect and store billions of data elements covering nearly every U.S. consumer, with some individual brokers adding several billion new records to their databases every month.¹ Once your number is linked across enough of these systems, it becomes a stable anchor that ties the rest of your identity together.

The Numbers Behind the Risk

This isn't a fringe concern. The scale is well documented at this point.

Americans lost $470 million to scams that started with a text message in 2024, five times what was lost in 2020.² Imposter scams alone drew more than a million reports last year, with losses climbing nearly 20% year-over-year to $3.5 billion.³ Phone-based scams are getting more expensive per victim, too — the average reported loss from a scam that started with a phone call reached $3,690 in the first half of 2025.⁴ And a recent Senate Joint Economic Committee report tied roughly $20.9 billion in consumer losses to major data broker breaches, underscoring how much of the fraud economy traces back to information that was never supposed to circulate this widely in the first place.⁵

The Problem: Your Number Isn't Just for You Anymore

A phone number used to mean one thing: one person, one line of communication. Today it does double duty as a login credential, an advertising identifier, an identity verification tool, and a cross-platform tracking signal.

That's a real privacy tradeoff. Once a phone number is shared widely enough, it can end up sold through marketing databases, folded into data broker profiles, exposed in a breach, scraped into people-search sites, or used as the entry point for phishing and scam campaigns. And unlike a password, you can't just reset a phone number once it's out there.

Why This Creates Real Risk

The more places a number appears, the more chances there are for it to be misused — scam texts impersonating banks or delivery services, phishing attempts that use your name or location, spam and robocalls, SIM-swap or account-takeover attempts, and general profiling across platforms you didn't know were connected.

Scammers are increasingly good at stitching together fragments of personal data to make a message feel legitimate. Something as basic as a name paired with a phone number is often enough to make a scam feel credible.

The Bigger Trend: Data Accumulation

This isn't really about any one app asking for your number — it's about accumulation. Your number can exist simultaneously in retail databases, loyalty programs, marketing platforms, app ecosystems, old accounts you forgot you had, and data broker networks.

Individually, none of these feel like a big deal. Over time, though, those fragments combine into a surprisingly complete identity profile — and once that happens, it's genuinely hard to control where your information turns up next.

What You Can Actually Do About It

You can't avoid phone numbers entirely — plenty of services genuinely need one. But you can reduce your exposure and DataSeal can help.

• Use a secondary or temporary number for non-essential signups
• Reserve your real number for high-trust services only
• Choose email-only signup when it's available
• Review app permissions and marketing preferences periodically
• Check periodically where your number is showing up online

Sources

¹ Federal Trade Commission, Data Brokers: A Call for Transparency and Accountability — ftc.gov

² Federal Trade Commission, New FTC Data Show Top Text Message Scams of 2024; Overall Losses Hit $470 Million — ftc.gov

³ Federal Trade Commission, New Trends in Reported Imposter Scams — consumer.ftc.gov

⁴ U.S. PIRG Education Fund, Phone Scams Flourish as Robocalls Increase by 16% — pirg.org

⁵ Forbes, Data Brokers Fuel Scams: Senate Report on Billions of Consumer Losses — forbes.com

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