When you first create your Facebook profile, you fill out the forms and provide your information based on the friends you have. Over time, and after accumulating more friends, you may want to change some of that information, such as your cellphone number. Leaving your cellphone number out there for all of your friends to see could leave you getting calls from people you’d rather not regain contact with. If you still want people to be able to reach you, you can swap out your phone number for an email address.
Navigate to Facebook.com and log in to your account.
Click the “Edit My Profile” link to the right of your avatar on your profile page.
Click the “Contact Information” link in the right column of the Edit Profile page.
Highlight your phone number in the Phones field and then press the “Delete” key.
Click the “Save Changes” button at the bottom of the page.
Click the “Add/Remove Emails” link in the Emails field.
Type the email address you want to appear on your profile into the New Email field.
Click the box next to “Allow friends to include my email address in Download Your Information” if you want your friends to be able to download your email address. If you do not want to enable this option, leave the box unchecked.
Click the “Save Changes” button.
Enter your Facebook password when prompted and click the “Save Changes” button again.
Navigate to Facebook.com and log in to your account.
Click the “Edit My Profile” link to the right of your avatar on your profile page.
Click the “Contact Information” link in the right column of the Edit Profile page.
Highlight your phone number in the Phones field and then press the “Delete” key.
Click the “Save Changes” button at the bottom of the page.
Click the “Add/Remove Emails” link in the Emails field.
Type the email address you want to appear on your profile into the New Email field.
Click the box next to “Allow friends to include my email address in Download Your Information” if you want your friends to be able to download your email address. If you do not want to enable this option, leave the box unchecked.
Click the “Save Changes” button.
Enter your Facebook password when prompted and click the “Save Changes” button again.