4.
It depends on the type of wallet you use.
For most popular software wallets, it’s ok to know only your backup phrase, a mnemonic phrase, consisting of 12 words. In case you forget your pin, you should just delete the app, install it again using the backup phrase, and create a new pin.
There are wallets that provide access via Touch/Face ID instead of pin-codes. For example, in the Lumi app[1], you should just switch on Touch/Face ID in the app settings. The good thing about apps like Lumi is that the only thing you need to know is a backup phrase. The bad thing is that once you’ve lost the backup phrase, you’ve lost an access to your wallet. In this case, technology is helpless. The last hope for such luckless crypto owners is hypnosis[2].
References
- ^ in the Lumi app (lumiwallet.com)
- ^ is hypnosis (cointelegraph.com)
