anyone having no sim card insert problem with iphone4? digi set

ok i would like to know is the an app in cydia that allows u to have this feature i stated in title? example would be the n9 where u double tap ur lockscreen(not visible/black) then it will wake and show ur ls...this is to ensure that either home or power button wont be needed to wake the lockscreen...activator i found out only for the ls screen is visible only..