Ask HN: Do you use spreadsheets on your smartphone?

Hi HN, I'm doing some research on how people are using spreadsheets on their phones. If you're one of them, I'd like to talk to you.

I'm curious about which is your preferred spreadsheet app, what you use it for, and if you're facing any problems.

My email's in my profile, but I'm happy to email you or talk on skype. Thanks!