Interesting web page about electronics repair in other cultures, such as
China and Africa:

http://www.janchipchase.com/repaircultures

A cellphone is small enough that you can open a repair shop with a little
knowledge and a little flat surface to work on.

Need spare parts? Cannibalize another cellphone.

Schematic? Service manual? It's easier to ask a friend about common
faults and repair techniques. (Hmmm. Come to think of it, that's what we
do here!)

Authorized repair station? Yes, they exist, but there are a lot more
independent technicians doing a lot more business on the streets.
Cheaper, quicker, more available.