There are couple of sites that offer a good background into...

There are couple of sites that offer a good background into mobile use in Asia
www.mobileecosystemsforums.com and www.internetsociety.org
the fist shows ave cost of mobile data hr in hrs needed to work..ie:
Singapore 1.46 work hours
Thialand 2 .52
Malaysia 3.51
Indonesia  5.16
Vietnam 6.04
Philippines 5.22
2nd site gives interesting info and shows why SYT focused so heavily on andriod before IoS

Asia Pacific

90% access internet via mobile device
72% aged 15-24 yr old are on a pre paid plan
80% overall are Andriod
IoS is less than 32%
70% have Entertainment apps
90% Social Media

It would appear IoS is more important for developed countries where from trial of Pokomon shows free data could be still a big thing.

Both sites wortha look if you want to get a handle on SYT market