Tor Browser for Android exists and works against WeTheNorth. This reading covers what changes on mobile and when to prefer desktop.
What works
Login. Anti-DDoS queue. Captcha with embedded address. Registration. Deposit. Order placement. Messaging. Dispute opening. Finalisation.
What is more friction
Copying 56-character onion strings is fiddlier because mobile browsers do not always handle long-string selection cleanly. Use long-press to select carefully.
Fingerprint uniqueness is worse on mobile because there are fewer mobile Tor Browser users and mobile screen sizes vary more. The anonymity set is smaller.
When to use desktop instead
Registration (mnemonic handling is easier). PGP verification (gpg or Kleopatra are desktop tools). Any high-value transaction. Anything where a mistake costs you money.
iOS caveat
There is no official Tor Browser for iOS. Third-party apps like Onion Browser are available but the anonymity guarantees are weaker because iOS forces all browsers onto the same WebKit engine. Prefer Android or desktop if you have a choice.