My old phone broke and it's time for me to get a new one. I'm considering the Samsung Galaxy Note 4 as my top pick. I think it'd be really cool to have a phone you could do by-hand calculations on. For example, instead of looking at Facebook, etc. on my phone while waiting for the bus, I could work on a problem, or brainstorm, or just fiddle around with physics (a little nerdy, I know). The Note 4 has a stylus and a big screen, so it might be the phone I'm looking for. Anyone have any experience with the Note phones? Are the screens responsive enough to be able to do math on? The phone is pretty big too. Do you think it fits well enough in your pocket?