1) You also have this question posted in another thread:
See my reply there for removing the phone number validation.
2) Next to each field you are validating, you can type the error message that should appear if validation fails. Then select that text and apply the Validation Show If server behavior (On the server behaviors panel, click the plus button and select Validation Toolkit -> Validation Show If)
In the Validation fail section, select the server validation that should trigger the error to show and click the plus button.
Add a new validation show if behavior for each error you wish to display.