How do in transfer all the contacts from an iphone 4s to an iphone 6?

My existing iphone 4s has been backed up onto my mac/itunes.
I have a new iphone 6 coming on friday,
I will have a new sim card, with a different network.

How do i make sure that everything is transfered?

All my contact are stored in Gmail Contacts and get synchronized with iPhone by "Google Contact" account in Settings - Mail, Contact, Calendars section of my iPhone.

This is the best way to make sure that any changes to your contacts immediately get updated in Gmail Contacts, i.e. Whatever happens to your phone most up-to-date backup is always there.

If you log in with the same Apple ID used on your 4S, I believe that if your contacts are stored in iCloud, they will appear in your contacts when you log in on your new iPhone

Recommend you iPhone Transfer software. It can help you transfer various files like contacts, text messages, videos, photos, songs and more between any two iOS devices including iPhone 6/5s/5/4s/4, iPad and iPod Touch.

I changed my iphone one year ago, in the first time i don't know to transfer contacts and photos from my old iPhone to iPhone 5s. I tried to one by one to enter the contacts. Oh, it's so difficult and waste much time. I''m searing on the internet found the very useful program, AnyMP4 iPhone Transfer Pro, it is an outstanding iOS data manager. It can help me transfer all iPhone files from old one to the new one. It can also transfer files between iPhone and PC.

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