Will jail breaking iPhone violate warranty?

I looked on Google and it's saying it will but I can remove the jail break with iTunes and Apple won't know it "was jail broken" and or I can use an app to remove it and my iPhone cost to much cost more than $900 and is it worth jail breaking? Wanna jail break to bypass ban on an app and I heard UDID Faker will work etc please help

Although it's easy to remove a jailbreak when you apply it the phone sets an internal flag which can be interrogated by Apple in the event of a warranty claim.

So yes, jailbreaking invalidates the warranty and Apple makes sure their warranty isn't abused