Most with head phones in and walking pretty fast...most definitely didn't seem like map reading to me.
We had to stop and use Google maps a couple of times, so we stopped at the side and were also looking around at street signs, not just barreling along getting through the crowds as quick as...
I was in London all day Friday and Saturday which was rammed with pedestrians - and was staggered at the amount of people (yep, mainly young women) face down in their phones walking around with absolutely no awareness of their surroundings. Even my wife, who is a bit of a mobile junkie at times...