Actually, I can't tell if that's a phone or a camera... leaning towards camera because they use clamshells in Japan.

Why cant it be both, the line on the side could be the seam for a flip phone

I'll take a potato chip... and eat it!

Also, there seems to be a common association with Sanae and a cell phone, to highlight her outsider-ness. It could be a slider phone.

Since when do you put cell phone straps on a camera, geez people.

Actually I have seen quite a few people doing that, something about it being easier to find in her bag.