If you got a new phone for Christmas, use your old one as a wallet.

Using an old phone is perfect for storing crypto if you don't have a hardware wallet(you should consider getting one).

When you get your new phone. Factory reset the old one, install whichever crypto wallets you need for the coins you have.
Keep the phone offline when it's not in use. You can even use this phone as a 2FA for exchanges.

Don't use this phone for anything else except wallets. Backup your seeds to paper and keep innansafe place, do not put them on a cloud account or store on your phone.