Change Apple Id

No need to shout. It does not look like you can change an Apple ID from a phone number to an email. Apparently, you will need to create a new Apple ID or contact Apple directly for the change.

Contacting Apple Customer and Support Service

1. Apple Store Customer Service at 1-800-676-2775 or visit online Help for more information.
2. Primary support help at Contact Support.
3. To contact product and tech support:  Contacting Apple for support and service including international calling numbers.
4. Starting  an  online  chat  with  Apple  Support.

How to Change Your Apple ID

[Originally posted by donv (The Ghost).]

1. Change your Apple ID (Be very aware of the restrictions here.) 
2. Before changing your Apple ID using a computer, sign out of all Apple  services that use your Apple ID. If you are going to use an iPhone, iPad, or iPod, then stay signed in with your Apple ID on only that device. This instruction is taken from the above document under the heading Before you change your Apple ID.
3. For sign out purposes, see Where can I use my Apple ID? “This list is provided for informational purposes only and is subject to change without notice. It's not intended to include every feature or service that uses Apple ID. Visit the Apple ID support page for more information.”
4. There may be some redundancy, but see What to do after you change your Apple ID or password.

(I have done minor editing to improve presentation.)