If you are going to store a large amount of coins in the future, you may have to learn how to use a deskstop or hardware wallet, a mobile device is not very good for storing coins that are of a large amount.

You can use Electrum for Android or BlueWallet for ios and android, though Electrum on mobile lacks some very good features like coin control, customizing fees, signing a message, etc. So you may prefer to use BlueWallet as your mobile wallet.