Is cracking wifi password Halal Or Haram and does it differ if the internet pckage were limited or not limited?
Stealing is haram in Islam:
"[As for] the thief, the male and the female, amputate their hands in recompense for what they earned [i.e. committed] as a deterrent [punishment] from Allah. And Allah is Exalted in Might and Wise." [Quran 5:38]
You cracking the WIFI password for your use is stealing since they are paying for the internet service and not you. You are using someone else's resources that are not yours which they pay cash for. Additionally, this can also be constructed as invasion of privacy since if you are on the network you can view most of the public files on many networks that are not secured:
"Do not spy on one another." [Quran 49:12]