Is this the app you are talking about? (https://play.google.com/store/apps/details?id=io.thephenom.phenom.platform&hl=en&gl=US)

I haven't bother downloading it because it probably scam. Do not pay them any USDT to "subscribe" to any package because that's the last time you will see your USDT.
I tried reading through reviews on Google play and I can firmly tell you it's filled with fake positive reviews.

When you look at the negative reviews, they tell a real story of people getting scammed by the people behind the fake mining app