How to Turn Off Ad Tracking and Limit Data Sharing on iPhone and Android in the US

Ads follow you across apps and websites because your phone shares identifiers, location clues, and app activity with advertisers by default. You cannot make tracking vanish entirely, but you can cut it down sharply with a few settings on iPhone and Android. This guide walks through the controls that matter most in the US, in plain steps, so you can tighten privacy without breaking the apps you use every day.

Step 1: Stop apps from tracking you across other apps on iPhone

On iPhone, open Settings, then Privacy and Security, then Tracking. Turn off Allow Apps to Request to Track. When this setting is off, apps cannot ask for permission to track your activity across other companies apps and websites, and that request screen stops appearing.

Revisit this screen after you install a new app, because a fresh install can add itself to the list.

Step 2: Limit ad tracking and reset your advertising identifier on Android

On Android, the exact menu names vary by brand and version, but the path is similar in most recent versions. Open Settings, then Privacy, then Ads, or search Settings for Ads. Look for Delete advertising ID, or turn on Opt out of Ads Personalization if your phone shows that option. Deleting the advertising ID removes the identifier apps use to build a profile, and apps then receive a string of zeros instead.

On Samsung phones, you may find the same control under Settings, then Privacy, then Ads, or under Google settings. On Pixel phones, it sits under Settings, then Privacy, then Ads. If you cannot find it, use the Settings search bar and type Ads. After you delete the ID, some apps may show less relevant ads, but they should still work normally.

Step 3: Turn off personalized ads in your Google and Apple accounts

Phone settings are only half the story. Your Google and Apple accounts hold their own ad personalization switches. For Google, open your Google Account in a browser or in the Google app, go to Data and privacy, then My Ad Center, and turn off Personalized ads. You can also review the topics and brands Google uses to tailor ads and remove ones you do not want.

For Apple, open Settings, then Privacy and Security, then Apple Advertising, and turn off Personalized Ads. This stops Apple from using your App Store and News activity to tailor its own ads. These account switches do not stop all ads, but they reduce how closely ads follow your interests and history.

Step 4: Tighten location sharing, which feeds ad profiles

Location is one of the strongest signals advertisers use. On iPhone, open Settings, then Privacy and Security, then Location Services, and review each app. Change apps that do not need your location to Never, and change apps that only need it sometimes to While Using the App. Turn off Precise Location for apps that only need a general area, such as weather or news.

On Android, open Settings, then Location, then App permissions, and review the same choices. Set apps to Allow only while using the app, or Do not allow, and turn off Use precise location where a rough location is enough. Also check Location History in your Google Account, and pause it if you do not want a timeline of past places stored.

Step 5: Review app permissions and background data

Open your permission manager and look for apps with access to contacts, photos, microphone, camera, and calendar that do not clearly need it. On iPhone, this lives under Settings, then Privacy and Security, with a section for each permission type. On Android, open Settings, then Privacy, then Permission manager, and review each category.

Remove permissions from apps you no longer use, and delete apps you forgot about. An app you never open can still hold permissions and collect data in the background. While you are there, check which apps can run in the background and use mobile data, and restrict background data for apps that do not need constant updates. Less background activity means fewer chances for data to leave your phone quietly.

Step 6: Use private browsing, clear data, and check new apps

In your mobile browser, turn on tracking prevention or enhanced tracking protection if offered, and block third-party cookies where the browser allows it. Use private or incognito mode when you search for sensitive topics, and remember that private mode hides history on your device but does not hide activity from your network provider or the sites you visit.

Once a month, clear cookies and site data for sites you do not need to stay signed in to. In Chrome on Android, this sits under Settings, then Privacy and security, then Delete browsing data. In Safari on iPhone, it sits under Settings, then Safari, then Clear History and Website Data. Clearing data signs you out of some sites, so keep a password manager handy if you use one.

Before you install a new app, read its privacy label in the App Store or Google Play. Look at what data it collects and whether it is used to track you across other apps. If a simple flashlight or calculator asks for contacts and location, look for a simpler alternative. After installing, deny anything the app does not need for its core job.

Limiting ad tracking is not about reaching perfect privacy in one afternoon. It is about closing the biggest gaps: cross-app tracking, advertising IDs, personalized ads, precise location, and over-broad permissions. Set those controls once, check them after major updates, and your phone will share far less about you than it did before.

Frequently Asked Questions

Will turning off ad tracking stop ads completely?

No. You will still see ads, but they should be less tied to your activity, interests, and location. Some ads may feel more random, which is a sign the personalization controls are working.

Why do I still see targeted ads after changing these settings?

Some tracking comes from websites, signed-in accounts, and data brokers, not just your phone settings. Turning off personalized ads in your Google and Apple accounts, clearing cookies, and limiting location helps, but it does not erase data already collected elsewhere.

Should I delete my advertising ID often on Android?

Deleting it once, then checking after major updates, is enough for most people. Deleting it again later can help if you notice tracking creeping back, but frequent deletion is not required for the setting to work.