To all the people saying things along the lines of "how hard is it to turn your phone off, just grow up, it's not that important to text people back etc".
First, the OP stated that he was turning his phone off, not replying or anything like that. Second, I have about 15-20 hours of classes a week. Am I an idiot because sometimes I forget to turn my phone to silent, or turn it off before I get to class?
OT: You being reprimanded for turning your phone off is just retarded. My lecturers mostly ignore phones. If a phone goes off, they pause for a few seconds, allow the person to stop it and turn it off, then they continue. Because they don't expect everyone to remember to turn their phone off every time. Considering you weren't even disturbing the class, I'd say your lecturer is just a *****.
Now, taking points off your test, surely that's not allowed... I don't know, you really should ask someone about that. Kicking you out, I don't think she can put up much of a fuss if you don't leave. I'm pretty sure I can't be forced to leave a class, unless I'm doing something to interrupt the class like constantly talking or something stupid. Marking you absent? Blatant lie, so you should definitely contest that. I just realised, I'm not sure what you mean by college though... Are you using it as a synonym for University, or are you in one of the countries where they are separate things? Cause I guess that could change matters.