I don’t do AV for my phone
For my home PC I trust Windows defender it’s as good as anything else out there because MS, love them or hate them, have a lot of computing power and people doing analysis of threat and pump out AV signature maintenance all the time, they do this for all their corporate customers and consumers get the benefit as collateral because it’s in their interest to have personal protected also (ecosystem innit)
Cougar makes a good point here “Because consider what’s on your phone these days: all your cached passwords, a banking app, your MFA stuff, your “reset my password” email account set to auto-login…” but the answer to this isn’t AV, it’s a password manager and being really careful with the password for your email as this is the entry point if someone tries to hack you. Also be smart about where you use your email address and don’t lose your phone