Benedict Evans sums up the current state of the mobile market:
“In other words, Apple has 20-30% of the market by volume, but it is the top 20-30%. Google ‘has’ the rest, but has only a very tenuous connection to large parts of it, and another large proportion is likely to be worth little or nothing for a long time. Roll on uncertainty (link): everything will change, again, in the next year. ”
This is only phase one. Whether iOS and Android are even in the same market most of the time is up for debate.