I've done it lots of times before and updated and it went away but i can't decide if i should do it again, and my warranty is already voided, my phones white, so i don't care about the warranty. Should i do it or not, and why.
Just unjailbreak (aka restore) it if you are not happy with it ( which is almost impossible ( to not be happy with it i mean)).
You warranty is intact unless you tell them that you jailbroke it... which would be pretty retarded.
/topic
No, my warranty is voided just if they see the phone, its white. And not a case, really white.
Well.... if you installed white parts on you i4 this has nothing to do with the warranty.
Anyways, jailbreak it. You'll like it.