If you happen to use multiple online social and mail services and want to access all the contacts from those services on your iPhone 5s, then just follow the following tips to do so right on your device.
To use your iCloud contacts, go to Settings, tap iCloud, and turn on Contacts.
To use your Google, Yahoo, or Microsoft Exchange contacts, go to Settings, tap Mail, Contacts, Calendars, select the account, and tap to turn on Contacts.
To use Facebook contacts, go to Setting, tap Facebook and turn on Contacts.
To import contacts from a SIM card, go to Settings, then Mail, Contacts, Calendars, and tap Import SIM Contacts.