Please be advised that the people behind Bitcoin.com are shady as hell and you should even never use their wallet. They claim that Bitcoin Cash is the real bitcoin and BTCitcoin is just another altcoin. They will confuse you in every way possible.
My advice to you is once your transaction is confirmed and you have received your BTC in your address. Import your private keys to a much better wallet like Electrum (they have mobile apps too) and delete the Bitcoin.com wallet.
Be very sure that you are downloading the right wallet as their many fake apps out there that could steal your funds.
The issues arise if you lose your phone or if you delete the wallet. You will lose all the funds in it as there can be no other way of restoring your address apart from using the backup phrase or private key or backup file.