Network Monitor

Project Fi users - if you're curious about which carrier your phone is using, this is the perfect app for you.

Quickly see which carrier your phone is connected to at any time with the carrier network notification. While in the United States, this notification will tell you if your phone is connected to Sprint, T-Mobile, or US Cellular networks. Support for international roaming coming soon!

Also, this app will notify you when your phone is using the cellular network for data service. Help save money on your bills by being reminded that you are using cellular data.

See your current MCC/MNC as well as a history of your cellular network carriers, data service providers (mobile vs. WiFi), and locations where your phone switched carriers and data providers.

Permission explanations:

Phone - this app requires permission to access your phone so that it can detect changes in your cellular network state, whether you are using mobile data, and which cellular network your phone is connected to. This app does NOT make phone calls or send text messages.

Location - this app requires permission to access your location so that it can more reliably detect when your phone switches cellular towers as well as provide your location to you in History. This app does NOT send your location to the developer.