Whenever I try to build an iOS app to my iPhone device I get the following error:
Your development team has reached the maximum number of registered iPhone devices.
I've previously had a Developer Program Membership that is now expired that I used to build apps on my old iPhone.
How can I delete that old iPhone from my list of devices? The Apple Developer support page says
I should go to Certificates, IDs & Profiles
at https://developer.apple.com/account/ but I can't find that menu.
I believe this is a problem with paid developer accounts that have expired and become free developer accounts. Technically free accounts are limited to 3 devices. If you have a previous paid account that had more than 3, I bet Apple didn't clear out those devices, which means you are over your limit of devices. Other are experiencing the issue here.
I think your best move would be to sign up for a new, free account, or pay to restore your access to the full 100 device limit for a paid individual account.