British carrier O2 announced plans to sell a flagship HTC phone without a charger two months ago, and the results of that experiment are in. After selling the HTC One X+ with just a Micro USB cable for three months, it turns out that 82 percent of customers elected not to buy a separate wall charger with the phone. That's beyond the carrier's expectations — it had predicted that 70 percent of customers wouldn't need the extra charger in the box.

In a statement, O2's chief executive Ronan Dunne said that the results should prompt other carriers to make similar moves for the sake of the environment; it's estimated that there are over 100 million unused chargers in the UK. O2, for its part, has pledged to stop selling phones with chargers by 2015.

"The lesson for the industry from this pilot is that consumers are very receptive to the message that they can benefit the environment by avoiding the needless purchase of chargers. I would now like to see others taking similar steps, working with us as we aim to ensure all our handsets are sold charger-free by 2015."