With some people calling you more often than others (mother, father, souse, employer, for example), here is an option on the iPhone that may be of interest to you.
In the "Telephone" application, represented by a green icon, you will find a section called "Favourites". This will allow you, as its name indicates, to list your favourite contacts.

To add users to the list you simply have to hold down the '+' button to the top right, before scanning your contacts list. Once you have found the contact you want to add, simply select them.

To empty the list, you simply need to click on the "Edit" button to the top left, press the ‘-‘ button next to the contact in question and confirm that you want them to be removed via the delete button which will be displayed behind the contact.

From this created list, you will be able to contact a person by selecting their name, but also display their phone number, send an SMS or send a contact card by selecting the white arrow on the blue background.
