A few facts about India

Subscriber base: 376.12 million
Second highest in the world

Monthly subscribers addition: 10 million
One of the highest in the world

Wireless penetration: 35.65%
Lowest in the world

Prepaid base: 92%
One of the highest in the world

MoU: 449
One of the highest in the world

APRU: US$6.83
One of the lowest in the world

RPM: 1.4 cents
One of the lowest in the world

VAS: 9%
One of the lowest in the world

source:
[1] Anchor Report: Telecoms India: Nomura Singapore Ltd: 15 April 2009
[2] TRAI

Cost of tower

Finally I found out the cost of building a tower:

Ground-based tower: Rs. 27,50,000 (including Rs. 1,50,000 of annual opex)
Roof-top tower: Rs. 15,00,000 (including Rs. 1,50,000 of annual opex)

Sources
[1] UBS Investment Research, India Mobile Sector, dated 24th March'09, Global ER->India->Wireless Communications->Q-Series