The two most common types of smartphones were those running on Android and iOS operating systems. Android, developed by Google, is used by a wide range of manufacturers like Samsung, Huawei, Xiaomi, and others. iOS, on the other hand, is exclusive to Apple devices such as iPhones.

As for the most popular apps, they tend to fall into a few major categories:

1. Social media and messaging apps: Examples include Facebook, Instagram, Twitter, WhatsApp, Snapchat, and TikTok. These apps allow users to communicate, share content, and stay connected with friends and family.

2. Video streaming apps: YouTube, Netflix, and Amazon Prime Video are popular choices for streaming video content.

3. Music and audio streaming apps: Spotify, Apple Music, and Soundcloud are examples of popular music streaming services.

4. Online shopping apps: Amazon, eBay, and AliExpress are widely used for shopping and e-commerce.

5. Navigation and travel apps: Google Maps and Waze help users find directions, while apps like Airbnb and Booking.com facilitate travel planning and accommodation bookings.

6. Gaming apps: Mobile gaming is popular, with a wide variety of games available, such as Pokémon GO, Candy Crush Saga, and PUBG Mobile.

Most people primarily use their smartphones for communication (phone calls, messaging), internet browsing, social media, entertainment (music, video streaming), and gaming. Additionally, smartphones are used for navigation, photography, managing personal finances, and productivity tasks like managing calendars and emails. The exact usage pattern varies depending on the user's preferences and habits.
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence