I pulled up a dice roller on my phone and used that. Only one opponent objected. I complied with his request that I used 'real' dice, and my next roll was 3 crits out of 4 dice.
I have a feeling that the community wouldn't approve of dice apps, but I happen to think they're fine. As long as it's an app that's widely available (itunes, android app store) so there's some kind of pedigree for the thing.

city by actuallymark, on Flickr
) I'll use a "normal" set if the opponent asks, though.