My old email account is not quite dead so I've managed to log in and I've just been on chat with them as suggested by this message: "To change your registered email address, or address details, please get in touch. We'll run through some quick security questions and update your info." which appears both on the website and in the app. They refused to update my info. I was told the only way to change the email address was to physically go to a Three Store (presumably with ID)! They wouldn't even put a note on my account that the email address they had recorded was almost defunct. I think this is a Disability Discrimination violation at the very least.
They kept saying it was for Security Reasons but I've managed to change my email address on numerous bank accounts today using 2-factor authentication. You wouldn't think Three needed to be more secure than a bank!
Edit: Weirdly, when I selected 'Manage Account Users' and 'Replace Contact', I was able to change from myself to myself - only changing the email address. It doesn't affect the login email but it may affect where they send correspondence???
Anyway, the answer is, take your phone and some ID and go to a Three store. (If you can. If you can't: tough.)
We do need to pass security with a One Time Passcode either to your mobile or email if updating the email over chat or the 333 phone line.
We do totally appreciate that a Three store might not be accessible to everyone though, so we have another process in place to help ensure we're meeting any vulnerability or accessibility needs. As you've mentioned disability discrimination, I'd just like to check that we're supporting you as best we can. Do you need further help with this? Feel free to message me directly if you'd rather not do this on the public forum. You can do this from my profile page: @JonathanB
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If you visit a store with a valid form of photo I.D so a drivers licence or passport then they can update the email address on the account.
customer services should be able to also update it provided you pass their security checks first.