For my personal convenience vs security threshold it's quite helpful but for those who trade daily it's probably too much effort.
On mobile, any of these are fine:
* Green Wallet
* Coinomi
* Coinbase Wallet (Wallet app. Don't keep your Bitcoin in an Exchange. It is not under your control at that point.). If you have privacy concerns WRT governments, don't use this option.
For more security:
* Use hardware wallets, such as Trezor
* Paper wallets in a bank's safe deposit box.
Otherwise I have a few hardware wallets around but haven’t used them much as I didn’t like that some required a Chrome app or other less than ideal, from my perspective, setups.
I have the backup phrase in a safe.
I do not have a lot of value invested in crypto assets. If you intend to store larger amounts, I wouldn’t recommend this set-up.
imToken 2.0 for iOS wallet and write down the seed phrase on paper, store in secret spots :)