Email addresses take way too long to spell over the phone when people ask for them. Mistakes happen all the time. Or it's just a mess of NATO alphabet soup.
So I can just say "O for Oscar, then my phone number at Gmail dot com." Chances are that the person I'm talking to can see my phone number so I just need to spell the first 3-4 characters and they can fill the rest. To avoid ambiguity around international prefix etc.
(Email addresses longer than 8 chars must contain a letter, so I replace the first 0 with an "O for Oscar", but you can do whatever works best for you). #entertainment source