When comparing My Data Manager vs Data Usage Monitor, the Slant community recommends Data Usage Monitor for most people. In the question“What are the best Android apps for monitoring data (Internet) usage?” Data Usage Monitor is ranked 1st while My Data Manager is ranked 2nd. The most important reason people chose Data Usage Monitor is:
Clearly shows how much data each app is using
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Pros
Pro Very intuitive interface
This app's interface is very simple to understand and use.
Pro Shows app usage
Clearly shows how much data each app is using
Pro Homescreen widget
Has a homescreen widget that shows the usage for Wi-Fi or mobile data, over any of the available periods.
Pro Usage stats as a notification
The current usage stats can be displayed as a notification.
Pro Dark theme and light theme
Two color schemes are available: Light and Dark.
Pro Premium features available after watching ads
Premium features can be enabled by in-app purchase, or enabled for one day by watching a video advertisement. You get one day per video ad, and you can watch one ad every 6 hours.
Cons
Con Recent update shows inaccurate data usage
A recent update (early 2017) has caused the data usage to become unreliable. It often wildly overestimates data usage, but will occasionally underestimate as well.
Con Intrusive permissions
Requests permissions for precise GPS location, as well as reading the contacts, reading SMS, and reading call log (which are required for call and SMS tracking).
Con Time periods are limited
The app only supports a fixed set of time periods: today, yesterday, every 3 days, past 3 days, this week, this month, last month. You can't choose any time period not in this list.