"For some challenges though, there are unique local solutions. Since many users have mobile phones but no access to electricity, battery charging stalls (shown in the photo below) have popped up in cities like Mazar-e-Sharif. One hour’s battery charging costs 10 Afghanis or 0.2 cents. A stall carries a variety of chargers to suit different phones. To charge the phone, a user is given a number tag and the same number is attached to the battery and the phone. It’s a system similar to how valets keep track of the keys of a parked car."