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Lots of people have such green lines on their phones

That’s legit and justifiable though I rather my apps to perform just one core duty and don’t unnecessarily append unnecessary functions to justify internet access.

And the calculator apps I’m referring to doesn’t have currency function. I only found out when I use root and XPrivacyLUA to monitor apps permissions some years back for context.

Might want to consider hosting your own Whoogle instance instead?

In the mobile space, there are Chinese calculators apps on Androids by manufacturers that require internet access…