Yes, there are some Apps for smartphones where you can get cryptocoins!!!! As far as i studied them, i can't tell you if they are legit or not, only by checking comments on play store (check on apple store aswell). You can get apps for many things such as:
- Wallets
Coinbase wallet has app on play store, so you can check your balances, buy and sell coins everywhere through your smartphone!
Also Coinomi is a full multi crypto app where you can exchange your coins via Changelly and buy tokens. Probably one of the best app wallet.
- Mining
Yes, you can put your smartphone to mine to your account. Check for MinerGate app on play store, enter with your account and start mining!
ELECTRONEUM is a mobile based miner. Just download the app, and start mining. Use code B4B94A in "more" section then referral program, and earn 1% more from what you mine.
- Other useful Apps
If you have equipment for mining such as GPU or ASIC, you can check with live prices what currency is best to mine with your equipment with "what to mine" app. Check it here.
If you are planning to buy and sell your coins all the time, you might want to know what price are they at that moment. You can check the live price of lots of cryptocoins in some exchanges with Crypto developped by investing.com is one of the most trustable live prices app.
Same as investing.com, CMA give you live time charts, but also has a portfolio where you can monitorize your holding and earnings. With ICO's, mining equipments, recently added coins, etc, you can track everything on the crypto world!