* Edited on November 27, 2017 to add *
The information in this post was accurate and correct in November 2011. It is no longer the correct way to change a phone number.
This is the procedure that should be used after November 2017:
Sign in to https://account.microsoft.com/
Click on Security
Click on Update your security info
Click on Add security info
Add the new number and remove the old
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* Original post *
I just did this to remove an old phone number - in Hotmail - upper right Options - more options.
On left Show Options - Hotmail - under Managing Accounts - Account Details - Account Security -
Security Info - Manage - Delete the phone number and follow the rest of the prompts.
That is what worked for me however if you have any issues then use Hotmail's Support.
Answers is a peer supported group and unfortunately has no real influence on Hotmail.
HotMail has its own Forums so you should ask your questions there.
Windows Live Solution Center - HotMail Solutions - HotMail Forums
Hotmail - Forums
http://windowslivehelp.com/forums.aspx?productid=1
Hotmail - Solutions
http://windowslivehelp.com/solutions.aspx?productid=1
How to Contact Windows Live Hotmail Support
http://email.about.com/od/hotmailtips/qt/et\_hotmail\_supp.htm
Windows Live Hotmail Top Issues and Support Information
http://support.microsoft.com/kb/316659/en-us
"Your account has been blocked" error message when trying to sign in
http://windowslivehelp.com/thread.aspx?threadid=77be7d82-a0e9-49c7-b46d-040ec654a9e2
Account Compromise - Unauthorized Account Access - How to Recover Your Account
http://windowslivehelp.com/solution.aspx?solutionid=6ea0c7b3-1473-4176-b03f-145b951dcb41
Hotmail hacked? Take these steps
http://blogs.msdn.com/b/securitytipstalk/archive/2010/07/07/hotmail-hacked-take-these-steps.aspx
Hope this helps.
Rob Brown - Microsoft MVP <- profile - Windows Expert - Consumer : Bicycle - Mark Twain said it right.