Particular brands, no, but I would guess mobile phone usage itself is more common among certain age groups and income groups.

Flybe said it has seen little demand for mobile phone usage.

In recent years mobile phone usage is dramatically increased in this area.

Finally, these are all based on our phone usage only, no tethering.

It will even help during phone usage, possibly music playback (either of which may be able to run in low power mode).

Boy helps surveys them about their feelings on indoor mobile phone usage.

Shannon draws up a time allocation schedule for everyone's phone usage.

I bet it wouldn't take 3 days of boycotting phone usage in malls to stop this.

Calls could also be shortened or limit mobile phone usage in rural areas.

The theory resulted in multiple countries banning mobile phone usage on aircraft.