Someone who has my email address has found out that my mobile number can be used to get...

GetHuman-paulacar's customer service issue with Yahoo from May 2018

Help with my Yahoo issue
Tip from another customer
Log in to Yahoo, and in the upper right corner select your name/ID. Choose the option for Account Info, then select either Personal Info or Preferences, depending on the info you wish to update.
The issue in GetHuman-paulacar's own words
Someone who has my email address has found out that my mobile number can be used to get into my account instead of my password. Since they have my phone number as well as my email address they can potentially get into my account without my password or permission. I therefore want to change the mobile phone number linked to my email account but don't know how to do it. I wish to keep my password the same.
GetHuman-paulacar did not yet indicate what Yahoo should do to make this right.
I have an issue with Yahoo too
How GetHuman-paulacar fixed the problem
I solved the problem by emailing yahoo and changing the phone number to one that was unknown to a third party. That way if I got locked out I could still get to my emails.
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Yahoo

Customer service issue
Reported by GetHuman-paulacar
May 23rd, 2018 - 6 mons ago
I have an issue with Yahoo too
Fixed
GetHuman-paulacar shared how to fix
Seen by 5 customers so far
Similar issue to 468 others
0 customers following this
Items needed
Email on Account
Username
Password
Name of Account Holder
Timeline
GetHuman-paulacar started working on this issue
May 23rd 3:17pm
GetHuman-paulacar confirmed the issue is fixed. Hooray!
May 23rd 4:18pm