We recommend you keep your wallet data backup stored somewhere safely and securely, outside of your phone.
To learn how to do a backup, see our tutorials here.
If you need to use your wallet on, for example, a new replacement phone, you can restore the wallet backup onto that new phone.
We also recommend that you immediately create a new wallet and transfer your amount from your old wallet to your new wallet. This is to reduce the chances that if someone finds your phone and unlocks it, they could transfer the amount out of your old wallet. So, you’d want to beat them to it and do it first. This way, the amount is kept only on your new phone.