Ask HN: Which hand do you use to hold your phone?

I'm doing some work right now on mobile apps and we were discussing the differences between iPhone, Android, and BlackBerry 10. On BlackBerry 10 and iPhone, handedness is less of an issue due to the absence of a back button. In both cases, it's in the actual app and is on the left side, which follows what most left to right readers would expect. The hardware volume buttons are on the right side of the device.

On Android, this is a bit different. On a Galaxy Nexus, the back button is on the left, and so are the hardware volume buttons. On a Galaxy S3, the menu button is on the left, while the back button is on the lower right. The hardware volume buttons are on the right too.

I usually use my phone in my right hand, so the iPhone, Nexus, and BlackBerry make sense to me. Apparently some of you hold your phone in your left hand.

I'm wondering what the distribution is. I don't think it has much to do with which hand is your dominant hand, because if it did, I can't explain why Samsung would switch sides. Could it be due to reading direction?

Interested in reading the responses.