There's a link between the size of your mobile phone and the way you interact with others.
Bigger can be better
Remember when mobile phones were used for, you know, exclusively telephoning people? Tell that to the average 14-year-old now and they'll probably look at you as if you had told them that you used to ride to school on a dinosaur.
Ever since they became smartphones, the telephone component has become almost redundant and they are now primarily tablet computers rather than a way to actually speak to someone.
But it also turns out this ongoing evolution in phones is having an effect on the way humans interact.
A Harvard Business School report released last week says the hunched posture adopted by smartphone users makes them less assertive than people using larger devices, even when they are no longer bent over their devices.
So we ought to be grateful for the latest range of larger "phablet" smartphones that defy the belief that smaller gadgets are always better.
The problem is, this new generation of phone is now almost too big to hold against the ear.