Apple application - Contact/Phonebook

Project Description:
https://www.freelancer.com/users/onverify.php?id=3654844&verifycode=jH3Pz0tYQLxd7s96

We are looking for the Apple iphone : Phonebook/contact like Viber Download VIBER from AppStore and take a look.

Requirements:

1) Only Contact Section like Viber.
2) Contact can view, add, edit and delete like local contact functions.
3) User Contact info will always synchronize to our server database.
i) The following local contact info are required to synchronize to our server database:
a) First Name
b) Last Name
c) Mobile
d) iphone

ii) If there is any update (add, edit & delete) at local contact OR at application contact, the code must have a function to synchronize the contact info to our server database.

4) There will be a local database in iphone to store our registered member handphone number. This local database is for the code to check which contact should display an icon beside the contact. This local database also must always synchronize to our server database.