Here is very simple steps to transfer google phone contact no transfer to iPhone mobile
Step 1: Sign in your gmail account.
Step 2: Select your contact and export it.
Step 3: Select given below option
Step 4: Then sign in to your icloud account.
Step 5: After sign in select contacts.
Step 5: In given below image left bottom of your screen their is setting option select import contact.
Note: Sign in your cloud id in your apple device (Mobile) turn on your data connection it will automatically synchronize the contact