The biographic information you enter here is used directly in the forms.

USCIS uses this information as part of your identity. It is best to ensure that your biographic information in any other immigration forms and your government issued ID's (unless that information is stale, like your weight).

Note about phone numbers: if you don't have a daytime phone number that is different than your mobile phone number, it is OK to use your mobile phone number in both places.