I’m noting a problem/dilemma that could be interesting for this thread. We’re changing two factor authorization (2fa) for all Mom’s logins to my brother’s iPhone to thwart new scamming. But ironically this is difficult with an AppleID! Mom’s iPhone is set as a trusted device, which seems to be necessary in order for the iPhone to be connected to her iCloud, photos, email, etc, which we want. But then the iPhone is prioritized for 2fa! We want instead that one of the prioritized telephone number be the only way approve logins and changes to the AppleID. But I can’t see any way to change this.