A few of many USDtz-ready wallets
Galleon
Galleon is one of the most popular Tezos wallets, created by Cryptonomic. The USDtz smart-contract itself was tested using the Galleon wallet.
Desktop for Mac, Windows (Mobile does not yet support tokens)
Ledger Compatible
Temple
Temple is a mighty Tezos wallet from the team at Madfish Solutions, who have been proving themselves as a potent force in the world of Tezos development.
Chrome/Brave Browser Extension and Mobile
Ledger Compatible
Trust
Trust wallet is a very popular multi-chain wallet that includes tokens for Tezos as well as for Ethereum and many other protocols.
Mobile and Browser
Ledger Compatible
Kukai
Kukai is a web wallet that uniquely employs DirectAuth, enabling users to login to the wallet with one-click, using an established account from another platform (i.e. Login with Twitter, Login with Google)
Web wallet only
Ledger Compatible
AirGap
AirGap is an elegant and powerful Tezos wallet. The AirGap team also created Youves, and Beacon — the underlying technology which enables web-wallet interaction.
Mobile and Desktop
Plenty Wallet
Plenty wallet is a multi-purpose mobile wallet created by the Tezsure team — creators of PlentyDeFi (decentralized exchange and yield farms).
Mobile Only