I am using an Android phone. Is it possible for spyware to transmit data even when I don't have any internet plan/connection? Can it use some other way, say, cellular network etc.?
EDIT1: SMS and calls in my mobile are chargeable, so if any spying software uses these ways to send call recordings or surrounding recordings or any data, I should be able to do find out. Would your reply change in this scenario?
EDIT2: I suspect my roommate has installed spyware in my Android phone. He is not a hacker. So, he has to rely on spywares available out there, free or paid. So are there such spywares available in market, which can work without internet connection?