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Some people find period tracking apps very useful.
Oh that looks ancient. Lollipop?
I’m guessing that the lookup feature can’t find a suitable candidate so it elects to say nothing.
Nah, it’s older, gingerbread?
Edit: maybe even froyo
It is 5, just touchwiz.
You might wanna look into if you can flash a custom ROM on that. If not for anything else but urgent security fixes.