Is there a way that you can go up to him either before or after class and ask if you can meet with him one on one? You can talk about any concerns you have or clarify any questions about the material and he won't be able to get out of answering (hopefully).

I have been in a class where every single person dropped the class (I was the second to last person to drop and the last person dropped the day after me). It might just be that he's a flakey instructor and few people are willing to waste their time. I know that I wouldn't.

I thought had a thought. Is your professor old? Maybe he's just not with the technology of the time lol. I think it's very odd that he gave out his personal cell phone number. I was told that even if professors do that, don't take them up on it.

I guess if worse comes to worst, you could get the administration involved. Go talk to the dean or something.