I need a developer who has experience to create a simple address book app for iphone. you could use the address book UI framework from IOS that could make things easier to manage so you do not have to start from scratch.
The contacts from this app can not be mix with the contacts from the mobile or icloud, meaning the contacts from this app are independent from the address book app from the iphone, this app should synchronize to a remote server using a API, the API is done so you do not worry about it. you just need to learn how to use it.
Synchronization: The app should update changes to contacts(new, delete, update) from the iphone and download the latest contacts info from the server.
do not send proposals if you do not have experience to develop this kind of apps