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Everywhere you've been -

Your smartphone constantly tracks your location, building a detailed history of places you frequent, such as your home, work, and even social spots.

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Your daily routine -

Smartphones use sensors to infer whether you're walking, sitting, or sleeping, monitoring your behavior second by second. 

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Your friends' locations -

Some apps allow you to share and track the locations of friends and family. While helpful for safety, it's also a gateway for monitoring others. 

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Your sexual orientation -

Dating apps store sensitive data like your sexual orientation. In some cases, this data has been used to out people, exposing privacy risks.

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Your online searches -

Smartphones track your search history to build a profile of your interests, enabling advertisers to personalize your experience. However, it also exposes your private curiosities.

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Your religion -

Your phone's location history or app usage can reveal where you worship, potentially exposing your religious beliefs. Apps and GPS data make it easy for third parties to uncover these personal details.

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Everything you've told Siri or Google Assistant -

Virtual assistants like Siri or Google record your questions and requests. This data helps improve services but also stores potentially sensitive information. 

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Your passwords -

Using your phone to store passwords may feel risky, but many cybersecurity experts recommend it. A built-in password manager can protect you from the dangers of password reuse across different platforms.

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Your social media behavior -

Phones log your interactions on social media, tracking likes, comments, and shares. This data is used to shape your newsfeed and target ads.

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Your menstrual cycle -

Period-tracking apps collect detailed health data about your menstrual cycle and fertility. However, many share this sensitive information with third parties, increasing privacy risks.

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Your biometrics -

Smartphones store biometric data like facial recognition and fingerprints. While generally secure, this sensitive information could someday become a target for hackers.

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Your health data -

From heart rate to medications, smartphones linked to health apps track intimate health details. While convenient, this data often lacks the protection of privacy laws. 

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Your contacts -

Your phone accesses your contact list and logs of your most frequent calls and messages, revealing your regular interactions and the nature of your relationships.

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Google knows everything -

When you log in to an Android device, it syncs with all your Google accounts, giving Google access to your phone's data.

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Your mood -

Phones analyze data such as sleep, activity levels, and app usage to assess your emotional state. Some studies suggest that this digital footprint could be used to identify mental health conditions.

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Your app data -

Apps collect extensive personal data, from health details to location and browsing history. Fortunately, both Apple and Google now provide transparency tools, allowing users to control data-sharing permissions.

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Your financial habits -

Mobile payment apps track your purchases and spending patterns. This data helps apps offer personalized deals, but it also creates a detailed record of your financial behavior.

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Your sleep patterns -

Many health apps track your sleep habits, logging when you go to bed and wake up. This information reveals a lot about your lifestyle and health.

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Your shopping habits -

Your phone tracks every online purchase you make, including the websites you visit and products you browse. This data builds a consumer profile used for targeted ads and offers.

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Your driving routes -

GPS data on your phone keeps a log of the routes you take most often, helping it optimize navigation. It also gives your phone detailed knowledge of your daily movements.

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Your photos -

Every photo and video you take is stored, often categorized by location or people. This creates a timeline of your life, detailing where you go and who you spend time with.

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Your fitness routines -

Whether it's steps, heart rate, or calories burned, fitness apps track every detail of your workouts. This data helps shape recommendations but also reveals intimate information about your physical health.

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Your driving behavior -

Certain smartphone apps monitor how fast you drive, your routes, and even if you're distracted. Some insurance companies use this data to assess risk and offer lower premiums for safer driving habits.

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Your app usage -

Smartphones track the time you spend on each app, identifying your most-used applications and habits, which reveal patterns in your daily tech use.

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Your favorite food spots -

Location services and apps like Yelp track the restaurants you visit. This information not only tailors recommendations but also creates a profile of your dining preferences and routines.

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Your typing speed -

Smartphones track how quickly you type and even your common typos. This data helps improve predictive text, but it also offers insight into your communication style.

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Your voice recordings -

Voice assistants save recordings of your voice, including sensitive conversations. Without proper security measures or due to accidental triggers, these recordings can be misused.

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Your travel plans -

Smartphones track your travel searches, bookings, and itineraries, data, which are used by travel apps to recommend flights and destinations.

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Protecting your data -

While essential in daily life, it's crucial to understand the data your phone collects. Manage privacy settings, verify apps, and share personal information cautiously to protect your data.

Sources: (Reader's Digest) (CNBC) (U.S. News & World Report) 

See also: Cell phone etiquette rules you should be following

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