For all of you struggling , follow these instruction. It works, because I've done these to 10 phones and it all worked.
1- Update to the latest 5.1.1 and make sure you activate it through Iphone (very important)
2- Jailbreak the Iphone 4s through Absinthe 2.0.2 ( google it if you don't know how )
3- Install these repos : http:// v.backspace.jp/repo and install CommCenter*patch. Also add this repo
http://cydia.myrepospace.com/polysony and install i-4s Network Package.
4- after that insert the white sim with the gevey unltra s and chose your carrier (sprint or verizon) and immediately eject the sim
5- Finally put your sim with the gevey ultra s and you should see the Ultra s unlock success screen.
Sometimes you will get the activation screen required may pop up, just remove the sim, record a memo and insert the sim while it's still recording and let it play in the background. If you get the activation screen just hang up and remove the sim.