One way to compare the available free apps on a T-Mobile compatible Android or iOS device is by looking at star ratings and reviews on Google Play Store on Android or App Store on iOS. Another method is to check websites such as PCWorld and CNET, which review mobile apps.
Google's Play Store is the largest app store in existence as of April 2015 with over 1,300,000 paid and free apps available. The Play Store is the official app store of Google's Android operating system for mobile phones and the primary rival to Apple's iPhone operating system, iOS, and its official app store, the iTunes App Store. Each of these platforms offers rich search and sorting features with user reviews and ratings being a primary factor in determining the rankings of apps. Both stores also feature free and paid sections.
The types of apps available on each app store include games, photography, messaging, social media and security. The most popular apps are games, and many come in free and paid versions. Free versions of paid apps utilize in-app advertising to make money for the developers or do not contain certain features from the paid full version in exchange for remaining ad-free.