Why is one user missing fields in the contacts module?

Why is one user missing fields in the contacts module?

Hi,

One of our users isn't able to see certain fields in the contacts module. For example, we have a field called Phone where users need to be able to enter phone numbers and this user is missing that field completely. There are about four other fields that he also cannot see on his screen. Please help as this user will be adding contacts and therefore needs to be able to enter these important details! Thanks.