StormGain recently released a Cloud Miner (still in beta) for their mobile App. I've installed it yesterday an so far in 3 runs of 4 hours i made about 0.80$ in BTC. You can cash out once you reach 10 USDT worth of bitcoin mined. The company seems well established and trustworthy to me.

Now how it works is, that it's a cloud miner so your phone is not the actual mining hardware, which means it's not gonna drain your resources. You just have to open the app once every 4 hours and start a new mining cycle (i've already created an alarm on my phone to not forget it).

"Cloud Mining is performed on equipment owned by StormGain and does not use the resources of a user's device". 

If you're interested you can sign up here: StormGain

You get rewarded 3 USDT worth of bitcoin to your mining wallet for using it, so you can make your first withdrawal after 7 USDT mined