How can I execute the 'BTconnect email settings iPhone' procedure?

You may provide access to your BT Mail account through IMAP or POP. You may use IMAP & SMTP Servers to configure your btconnect email settings on iPhone. Navigate to the Settings option on your iPhone and open it. Make certain that the Mail, Contacts, and Calendars option is closed. Add Mail Account. Enter the incoming (IMAP) and outgoing (SMTP) email servers, with credentials.