it might be an old topic , but i recently needed to transfer contract from Nokia phone to Iphone .after long reading i figure it i can export my data from Nokia to CSV file , then import it in my gmail account . which is much easier .
the only thing left is how to configure the iphone to read gmail contact . the answer is my creating a CardDAV account , below is how
go to setting
choose mail ,contact , calendar , and then choose other option
after that choose the contacts tab , and select add CARDDAV Account
NEXT , fill in the details as below , the Server name is google.com , username your gmail account , and password .
after that go to your contact and refresh the data 🙂
more important , any update you do it will be sync between gmail and iphone .