Should i completely charge a new iphone 4s before use?

I'm with sprint and upgrading to an iPhone because my Android battery sucks ***. I've heard that charging the phone completely before turning it on will ensure good battery life, however I've also heard that using all of the battery first and then charging it completely works. Which one? Or can I just use it right away?

Yes it will. Usually the phones they are half full from the manufacture but to ensure that you will have a good life long battery the first time you get it is better to leave it 8 hours to be charged and after use it. Some tips for the battery to last long always have you Wi-Fi off open it when you need it because your phone is always searching for network to connect and it is using a lot of battery to do that. Turn the 3g off 3g is only important when you have internet connection on your phone because is giving you faster speed online. To turn the 3g off from your iphone you go to cellular cellular data and turn off 3g.