Standard Formatting
The Common formatting for phone numbers is as follows:
+1-555-555-5555
1-555-555-5555
555-5555
5-5555
x 12356
How to Ask for Phone Number
When presented as part of a form input the help text should be as follows:
<label />
<Input type="phone" />
<helpText>416-___-_____</helpText>