The only way to send and receive Bitcoin is through a Bitcoin wallet. A Bitcoin wallet is a digital storage space that allows you to store or send your Bitcoin. Every wallet has a unique wallet address that is specific to your wallet.
No matter which wallet provider you go with, make sure that you write down your username, password, and private key, and to store that information in a safe place. Never share that information with anyone.
The wallets we recommend for Android is our own Bitcoin Depot app: https://play.google.com/store/apps/details?id=co.bitcoindepot.app
IOS the Copay wallet app: https://apps.apple.com/us/app/copay-bitcoin-wallet/id951330296