The Trust wallet for Android has the DApp browser enabled by default but for iPhone it requires a quick change to the settings.
1. Open Safari and type trust://browser_enable in the address bar and then press go in the keyboard.
2. Click Open to link to the Trust wallet.
3. The DApp browser is now available in the Trust wallet for iPhone.
To mint domains on the Trust Wallet mobile app browser, you will need to sign in to your UD account using the Email and Password option, instead of the Google Sign In option for it to work.
You can get a new password here: https://unstoppabledomains.com/password-reset