They can save you time
You can pay quickly using a mobile wallet by holding your phone over the payment terminal and validating the purchase. The majority of transactions can be performed in a matter of seconds.
You can trim your wallet contents
In addition to credit and debit cards, some mobile wallets may also hold loyalty and gift cards. Allowing you to keep them on hand at all times without adding bulk to your wallet.
You can shop online on the go
You can use your mobile wallet to pay for some items instead than typing in card numbers when shopping online. When you shop online, using a mobile wallet instead of a card on file reduces the number of sites where your card numbers are stored while maintaining a quick checkout.
You still receive rewards
When you use your card in a mobile wallet, you’ll still get cash back or other incentives if card offers them. It may even be easier to rack up points if you constantly have your virtual card on hand.
Reference:
https://www.pnc.com/en/about-pnc/topics/pnc-pov/economy/mobile-wallet.html