How to restore an I-Phone from a previous back-up
Hopefully someone can advise and help, before my I-phone 4S went faulty I was able to successfully back-up the phone to I- Tunes before it crashed. I have now transferred my sim to an I-Phone 4 which I previously used. It appears to have most of my contacts and apps, but I'm not sure how. Perhaps when I set up my I-Cloud account they were restored through this.
My question, how do I restore from I Tunes, all my apps and contacts from the I- phone 4S to the I-phone 4.
iPhone 4, iOS 7.1.2