You can quickly clear contacts from an iPhone by downloading the spring clean app. This app allows you to quickly and easily clear your entire contacts list with one button.
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One way would be to download a tool like Kvisoft iPhone Contacts Recovery software. Launch this iPhone recovery tool and connect your iPhone to computer. A detailed guide is provided in the accompanying link.
There are three ways to transfer contacts from old iPhone to a new one. You can sync the old phone to iTunes to import them then sync the new phone to send them to the new. You do the same using the Cloud with the old phone then retrieve them to the new. Or, you can use an app called Bump to move them directly from your phone to any other iPhone. Follow the related link below
You need to delete them one by one by selecting the entry you wish to delete from your contacts, select the edit button then select delete.
Syncing contacts generally refers to loading contacts from one devise to another. For example, you can sync the contacts on your phone to a tablet, a computer, or another phone.
You need the back up and restore application to transfer the GB from one phone to another phone. If you use iCloud, you can easily backup your old iPhone to iCloud, and then restore your data to your new iPhone. iTunes can also be used to backup your iPhone to your computer, and then also used to restore your data to your iPhone.