12.04.25 · The Cape Team

What Is a Mobile Advertising ID and How Can You Disable It? A 2026 Guide

Have you ever wondered how your phone seems to know to display an ad for a product you were interested in buying? You ran a single Google search for a new pair of shoes, and now you’re seeing shoes everywhere.

No, your phone can’t read your mind; it has a mobile advertising ID that advertisers leverage to track your activity and display relevant ads. While this unique identifier contributes to a personalized user experience, it also represents a significant invasion of privacy.

In this guide, we’ll explain what a mobile advertising ID is and why you should consider removing it. To save you time and simplify the process, we’ll outline steps for disabling the ID on Android and iOS devices.

What Is a Mobile Advertising ID?

A mobile advertising ID is your phone’s “advertising fingerprint.” It’s a combination of letters and numbers unique to every mobile device used for advertising purposes. Via this ID, advertisers and app publishers can track your behavior across apps and websites. With this data, advertisers create user profiles and target each person with ads that cater to their interests, previous searches, or purchasing habits.

Mobile advertising IDs are platform-specific. Android devices have AAIDs (Android Advertising ID), while iPhones have IDFAs (Identifier for Advertisers). Although they’re called differently, these identifiers serve the same purpose: providing your data to third parties for ad personalization.

It’s essential to distinguish between a mobile advertising ID and an IMEI (International Mobile Equipment Identity). The latter is a permanent, unique hardware identifier that isn’t used for tracking.

How Does a Mobile Advertising ID Work?

Once you install an app on your phone (regardless of the OS) and use it for the first time, the app retrieves the mobile advertising ID. Advertisers then compare this data against a database to analyze and understand the user journey, build profiles, and deliver ads.

Through the mobile advertising ID, third parties can access only your activity; they can’t get a hold of your personal information, like your:

Name
Email address
Payment details

While this is true in theory, practice suggests otherwise. Firstly, the mobile advertising ID reveals sensitive information, such as online behavior, purchasing habits, and app usage, which can often indirectly reveal your identity as well. If someone knows what you like, what ads you click on, and what products you buy, they don’t really need your email to identify you.

Secondly, there’s an entire industry that deals with connecting mobile advertising IDs to personally identifiable information (PII). Therefore, your mobile advertising ID may not collect your personal information directly, but it offers a gateway for advertisers to create a detailed profile of you.

Why Should You Consider Disabling Your Mobile Advertising ID?

The main reason to consider disabling your mobile advertising ID is to protect your privacy. The ID may not directly reveal your identity, but it allows third parties to learn more about your behavior, app usage, and habits. The thought of this information being accessed and manipulated by someone you don’t know, often without your explicit consent, is unsettling for anyone who values their privacy and security.

Over time, third parties can create detailed records on you, predict your behavior, and directly influence what you see online. Worse yet, data brokers and other parties can exchange your information, so even if a particular party never accessed your mobile advertising ID, they could still get your data from other sources.

Other reasons why you should consider disabling your mobile advertising ID include:

Reason	Explanation
Reducing targeted ads	Constant ads can affect the user experience, and many find them annoying and disruptive. Disabling your mobile advertising ID won’t eliminate all ads, but it will significantly reduce their number.
Making the surveillance advertising model less effective	This advertising model might be popular, but it poses a major privacy threat. By disabling your mobile advertising ID, you actively make the model less effective and the industry less profitable.

How To Disable Your Mobile Advertising ID on an Android and iPhone

Disabling your mobile advertising ID involves several steps, and they differ depending on your operating system. We’ll walk you through the steps for Android and iOS devices so that you can effortlessly complete the process and enhance your privacy.

How To Disable Your Mobile Advertising ID on an Android

Google (the company behind Android) began allowing users to permanently delete their mobile advertising ID in late 2021 and early 2022. Follow the steps below to disable it:

Launch the menu and open Settings
Tap Security and privacy
Scroll down and select More privacy settings
Tap Ads
Choose Delete advertising ID and confirm your decision

Note that disabling the ID will remove personalized ads, but you’ll still see ads that may not be as interesting to you. The action is reversible; you can always get a new advertising ID if your priorities change and you wish to see personalized ads again.

How To Disable Your Mobile Advertising ID on an iPhone

Apple has a unique approach to app tracking. Starting with iOS 14.5, the company introduced the App Tracking Transparency (ATT) framework, which requires apps to obtain explicit permission from users for data sharing and advertising. This means that unless you opt in, apps can’t access your mobile advertising ID.

This policy change has revolutionized the mobile advertising landscape and affected big companies, such as Meta, which have lost billions of dollars due to it.

If you’re unsure whether apps can access your mobile advertising ID and want to check your settings, here’s what to do:

Open your menu and go to Settings
Tap Privacy & Security
Open Tracking. Scroll down to see which apps have access to your mobile advertising ID and switch the toggle button next to those you don’t want tracking your activity
Switch the toggle next to Allows Apps to Request to Track to ensure apps can’t ask you to track your activity in the future

Can You Reset Your Mobile Advertising ID?

Disabling your mobile advertising ID protects your privacy, but it involves a compromise: you won’t be able to see as many personalized ads. If you enjoy this experience but want to get a “fresh start” and remove accumulated data, resetting your mobile advertising ID is a better option.

The action involves generating a new ID; once you set it up, your past activity will no longer be associated with it, and your profile will be built from scratch. If you see ads for products that no longer interest you, resetting the ID is an efficient way to start over.

Although resetting your mobile advertising ID doesn’t offer the same level of privacy protection as disabling it completely, it does break tracking chains and makes it significantly harder for advertisers to build detailed profiles of your behavior.

If you’re an Android user, follow the steps below to reset your mobile advertising ID:

Open your menu and go to Settings
Scroll down and tap Security and privacy
Go to More privacy settings and choose Ads
Select Reset advertising ID and confirm your action

Keep in mind that after resetting your ID, apps can still show you ads, but they won’t be as relevant until they “learn” your interests once again.

Since managing mobile advertising ID looks different on iPhones, there isn’t an option to reset it like on Android.

What Else Can You Do To Prevent Tracking and Targeted Ads?

Disabling your mobile advertising ID reduces exposure to personalized ads, but it doesn’t fully prevent tracking. To enhance your privacy and safeguard data, adopt these best practices:

Control app permissions
Carefully choose the apps you install
Use a privacy-first carrier

1. Control App Permissions

Even with the mobile advertising ID disabled, apps can still access some of your information (such as your location, photos, or contacts) if you let them. Apps can collect this data and use it for advertising purposes or share it with third parties, thus jeopardizing your privacy.

Worse yet, malicious apps can exploit these permissions to modify your settings or install malware or spyware on your iPhone or Android, compromising device security and potentially leading to financial loss or identity theft.

To maintain control over your data and prevent apps from being granted excessive permissions, review your settings periodically and make adjustments as needed.

Controlling app permissions looks the same on Android devices and iPhones:

Open Settings, scroll down, and tap Apps
Find the app for which you want to review permissions and disable those you don’t need

2. Carefully Choose the Apps You Install

Both the App Store and the Google Play Store have strict review processes that an app must undergo to get published. Still, there have been several instances of malicious apps on both these stores, like the recent SparkCat crypto spyware incident.

This shows that installing apps from official sources isn’t sufficient protection against malware and spyware. Double-check the developer for every app you want to install on your device and ensure it’s legitimate. You should also browse through reviews for any red flags, including bugs, privacy complaints, or unusual behavior.

3. Use a Privacy-First Carrier

Traditional carriers collect vast amounts of your information, often without you realizing. Since they rely on a trust-based infrastructure with poor defense mechanisms, big telcos frequently experience data breaches and leaks, allowing your sensitive information to easily fall into the hands of cyberattackers.

To ensure network security, switch to a privacy-first carrier, such as Cape, which offers a higher level of protection against leaks and breaches, guaranteeing the safety of your information. Thanks to minimal data collection, an advanced infrastructure, a unique “Don’t trust us” policy, and robust privacy and security options, Cape offers powerful protection from network-level threats.

Cape: The Carrier Built for Security and Privacy

Cape is a privacy-first mobile carrier designed to keep your communications safe from surveillance and misuse. Unlike traditional cell phone plan providers, our business model centers around providing you with premium and secure call, text, and data, rather than harvesting and selling your information.

Our service is built from the ground up with privacy and security at its core, offering unique features like:

Privacy & Security Feature	Description
Minimal Data Collection	Cape doesn’t ask for your name, address, or Social Security number. We only collect the information necessary to provide service, and we retain that information for the minimum amount of time possible.
Identifier Rotation	Traditional carriers rely on a fixed International Mobile Subscriber ID (IMSI) to connect your device to cellular networks. This is a vulnerability that lets carriers, advertisers, and bad actors identify and track your device. Cape lets subscribers automatically rotate their IMSI every 24 hours, making it infinitely more difficult to track you or your device.
Secondary Numbers	Many services ask for your phone number, but sharing it exposes you to spam, scammers, data brokers, and a variety of other risks. VoIPs, on the other hand, don’t work with 2FA, cost extra, and aren’t encrypted. With Cape, you get two free additional SMS/MMS lines that are middle-to-end encrypted.
Disappearing Call Logs	Most U.S. carriers store your call and text metadata for years, sometimes indefinitely. Cape is built to forget, so call data records (CDRs) are deleted after just 24 hours.
SIM Swap Protection	Cape nullifies the threat of SIM swapping by completely removing humans from the loop. During signup, you receive a 24-word phrase that generates a private key tied to your number. This effectively means that no one (but you) can move your number to a new carrier or device, not even Cape.
Network Lock	Legacy network protocols, like SS7, leave you vulnerable to hackers that can track your location, intercept your calls and texts, and steal sensitive information. Cape’s Network Lock relies on a proprietary signaling proxy to verify that your device’s physical location matches the network it’s trying to attach to. If we detect anything out of the ordinary, Cape automatically blocks the connection, nullifying the potential threat.
Encrypted Voicemail	Traditional voicemail systems are outdated, unencrypted, and another security hole bad actors can exploit to gain access to your sensitive information. Cape encrypts all voicemails, ensuring only you can access them.
Secure Global Roaming	While roaming, your phone connects to local telecom providers to enable service. But, who knows who might be listening on the other end. Cape provides you with peace of mind by routing your traffic through our U.S.-based mobile core, ensuring your identity, data, and communications remain private and secure.

Ditch Legacy Carriers: Get Cape Today

Cape is a “Heavy” Mobile Virtual Network Operator (MVNO), meaning we own our mobile core and provision our own SIMs. This gives us full control over how accounts are authenticated and what data is collected (and for how long), and is how we are able to provide privacy and security features no other carrier on the market can offer.

Get started with Cape today and enjoy the peace of mind, knowing you are fully protected against scammers, hackers, bad actors, and other mobile threats.

To help protect more than just your phone, we’ve partnered with Proton. As a new Cape subscriber, you can choose between Proton Unlimited and Proton VPN Plus for just $1 for six months.

FAQs

If I disable my mobile advertising ID, will I stop seeing personalized ads completely?
If I disable my mobile advertising ID, will I stop seeing personalized ads completely?
No—you'll still see ads, just less precisely targeted ones. Apps and websites can fingerprint your device in multiple ways beyond the mobile advertising ID: IP address, device model, OS version, screen resolution, time zone, language settings, installed fonts, and behavioral patterns.
The ad industry calls this “probabilistic identification” or “fingerprinting,” and Apple's ATT framework specifically prohibits it for ATT-compliant apps, but enforcement is uneven, and many apps still use these techniques.
Disabling the advertising ID does meaningfully reduce ad personalization quality. Advertisers can no longer build a stable profile linked to your device, but it doesn't make you invisible. For more complete anonymity, combine MAID disabling with a privacy-focused browser, limit app permissions aggressively, and consider a privacy-first mobile carrier that doesn't tie carrier-side identifiers to your account.
No—you'll still see ads, just less precisely targeted ones. Apps and websites can fingerprint your device in multiple ways beyond the mobile advertising ID: IP address, device model, OS version, screen resolution, time zone, language settings, installed fonts, and behavioral patterns.
The ad industry calls this “probabilistic identification” or “fingerprinting,” and Apple's ATT framework specifically prohibits it for ATT-compliant apps, but enforcement is uneven, and many apps still use these techniques.
Disabling the advertising ID does meaningfully reduce ad personalization quality. Advertisers can no longer build a stable profile linked to your device, but it doesn't make you invisible. For more complete anonymity, combine MAID disabling with a privacy-focused browser, limit app permissions aggressively, and consider a privacy-first mobile carrier that doesn't tie carrier-side identifiers to your account.
What's the difference between deleting and resetting my Android advertising ID?
What's the difference between deleting and resetting my Android advertising ID?
Deleting removes the ID entirely, so apps that request it receive a zero value, effectively breaking ad personalization. Resetting generates a new ID, breaking the connection between your past activity and your current ID but allowing apps to build a new profile from scratch.
Therefore, you should delete it if you want maximum privacy and don't mind seeing fewer relevant ads. You can choose to reset if you've noticed your ad profile is full of incorrect or unwanted categories (you've been shown ads for products you don't want), and you want a fresh start, e.g., after a significant life change, switching jobs, moving, or discovering your phone was shared with someone who used it heavily.
The reset option provides incremental privacy improvement rather than the substantial improvement of deletion.
Deleting removes the ID entirely, so apps that request it receive a zero value, effectively breaking ad personalization. Resetting generates a new ID, breaking the connection between your past activity and your current ID but allowing apps to build a new profile from scratch.
Therefore, you should delete it if you want maximum privacy and don't mind seeing fewer relevant ads. You can choose to reset if you've noticed your ad profile is full of incorrect or unwanted categories (you've been shown ads for products you don't want), and you want a fresh start, e.g., after a significant life change, switching jobs, moving, or discovering your phone was shared with someone who used it heavily.
The reset option provides incremental privacy improvement rather than the substantial improvement of deletion.
Does iOS App Tracking Transparency actually work, or do apps find workarounds?
Does iOS App Tracking Transparency actually work, or do apps find workarounds?
iOS App Tracking Transparency works substantially, but determined apps still find workarounds. Apple's ATT requires apps to display the Ask App Not to Track prompt and, if you decline, prohibits the app from accessing your IDFA, using device fingerprinting, or linking your in-app activity to data collected outside the app.
Independent research has shown that most major apps comply with the technical requirements. The IDFA opt-out rate after ATT launched was around 75%–85%, which substantially disrupted the advertising industry. The remaining workarounds include server-to-server attribution using probabilistic models, in-app behavioral profiling that doesn't link to outside data, and SKAdNetwork (Apple's privacy-preserving attribution framework, which is permitted).
Apple has been increasingly strict about App Store reviews for attempts to bypass ATT and has removed apps that violated the policy. For most users, ATT delivers meaningful protection against cross-app tracking.
iOS App Tracking Transparency works substantially, but determined apps still find workarounds. Apple's ATT requires apps to display the Ask App Not to Track prompt and, if you decline, prohibits the app from accessing your IDFA, using device fingerprinting, or linking your in-app activity to data collected outside the app.
Independent research has shown that most major apps comply with the technical requirements. The IDFA opt-out rate after ATT launched was around 75%–85%, which substantially disrupted the advertising industry. The remaining workarounds include server-to-server attribution using probabilistic models, in-app behavioral profiling that doesn't link to outside data, and SKAdNetwork (Apple's privacy-preserving attribution framework, which is permitted).
Apple has been increasingly strict about App Store reviews for attempts to bypass ATT and has removed apps that violated the policy. For most users, ATT delivers meaningful protection against cross-app tracking.

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