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Many smartphone users try to keep their bills lower by sticking with capped data plans from carriers or MVNOs like Project Fi. Making sure you don't use too much data can be a pain, though. Android has some built-in data tracking tools, but they're not very user-friendly. Google's latest app lets you exert more control over your data usage by plugging into these system features. The app is called Datally, and it's available on virtually all devices.
You might know Datally as Triangle, which was the name during Google's geo-limited testing period. Now the app is done and has a new name for its global rollout. Unlike most other data monitoring apps, Datally doesn't need to run for multiple days accumulating data before it's useful. It pulls in all the historic LTE usage info from your system-level features to help you figure out what's using the most data.
Datally shows you how much cellular data has been used each day and by each app on your phone. Should your data usage get out of hand, Datally also includes a data saver feature. Again, this is similar to functionality already included in the settings of most phones, but it's implemented in a much clearer way.
There are toggles throughout the app to turn on data saver, so Google seems to really want you to use it. This feature uses a VPN to control which apps can use data, but the app promises Google isn't examining your data. It's up to you to take Google at its word there. By default, no app can use data in the background when Data Saver is turned on. Only the apps you have up and are actively using can do that. In addition, there's a floating bubble on the screen to show you how much data the app has used in the current session.
Data Saver is completely configurable as well. If you want an app to have unrestricted background access in Data Saver, you can unlock it in the app. You can also completely disable cellular data in an app even if you open it. That's handy for apps that you know use a lot of data and you might open without realizing you're on cell data.
Datally also offers a list of local WiFi hotspots if you need to get a lot of downloading done while you're out. This list includes shortcuts to Maps so you can get directions.
This is a great app, and one that could actually save you money if you're on a limited or pre-paid data plan.