Jan Chipchase posted a nice article on the culture of repairing broken things (rather than just tossing them as garbage) in various Asian cities like Chengdu, Delhi, Ho Chi Minh and African ones like Kampala and Soweto:
What sets these locations apart from cities in more 'emerged' markets? Aside from the scale of what's on sale there is a thriving market for device repair services ranging from swapping out components to re-soldering circuit boards to reflashing phones in a language of your choice , naturally. Repairs are often carried out with little more than a screwdriver, a toothbrush (for cleaning contact points) the right knowledge and a flat surface to work on.
Repair manuals (which appear to be reverse engineered) are available, written in Hindi, English and Chinese and can even be subscribed to, but there is little evidence of them being actively used. Instead many of the repairers rely on informal social networks to share knowledge on common faults, and repair techniques. It's often easier to peer over the shoulder of a neighbour than open the manual itself. Delhi has the distinction of also offering a wide variety of mobile phone repair courses at training institutes such as Britco and Bridco turning out a steady flow of mobile phone repair engineers.
To round off the ecosystem wholesalers' offer all the tools required to set up and run a repair business from individual components and circuit board schematics to screwdrivers and software installers.