I have a new SIM/service and want to transfer all my contacts from the current 4S to the new SIM in my old 3GS. I do NOT want to backup/restore the entire phone contents (iTunes or iCloud), JUST the contacts. How?
Current phone 4S with service from one provider. Also have a new SIM with another provider, and want to copy my contacts from the 4S across to my old 3GS which I will be using for a bit as an alternative. Definitely do not want anything except the contacts copied across so a full backup/restore is NOT what I'm after, and I can't see (in the iTunes backup) how to only do the contacts.
iPhone 4S, iOS 8.1.3, iPhone 3GS