24/7 Wall St.

Smartphone penetration is nearly 80% in the United States, making that other 20% an important target for phone makers. According to the most recent count from comScore, 193.9 million Americans over the age of 13 own a smartphone, so a simple calculation indicates that there are still about 48 million Americans in that group who are potential customers.

The leading smartphone maker in the United States is Apple Inc. (NASDAQ: AAPL), with 43.3% of the subscriber market. A first-time iPhone (or iPad) owner is going to want to join the party, and the best way to do that is to download some free apps from the Apple App Store. Here are the 10 most popular free iPhone and iPad apps right now, according to Apple:

1. Cut the Rope 2: the app is free and also offers in-app purchases.
2. Facebook Messenger: a social messaging app.
3. Facebook: the leading social media app.
4. Instagram: a photo-sharing app.
5. YouTube: the leading streaming video app.
6. Snapchat: a social photo- and video-sharing app.
7. iTunes U: an app for teachers to create lessons.
8. Piano Tiles 2 (Don’t Tap the White Tile 2): another popular game app that also offers in-app purchases.
9. Pandora: a streaming music app.
10. Uber: a ride-sharing app (also available for Apple Watch).

24/7 Wall St.
5 Companies That Absolutely Destroyed Shareholders This Past Week