Why won't my iphone properly jail break?

After downloading the evasi0n jailbreak I plug in my iPhone 5 version 6.1.2 and the jail break all work until it asks for me to unlock the device and click on the jail real icon, but my problem is that there's no jail break icon at all in my phone. Is it my phone? My computer? Or why dose the icon not transfer to my iPhone, need help please As soon as possible

Using Evasi0n for the first time two days ago worked absolutely fine for me, although i had recently tried and was unaware that 6.1.2 works, but hey.

anyways, I found that i had the same problem, so i firstly restored my iPhone to new. Then tried it again and it worked perfectly. But now. I use the ultrasn0w or redsn0w because I use them more, and personally find them more reliable