Labor cost is insignificant. More so the cost of building infrastructure - BTS towers.
From the report [1]:
Tower cost in India (40-60k$) due to low land rent cost. Tower in Latin America (120-180k$)
Tower in UK - 200-400k£ [2]
[1] http://phx.corporate-ir.net/External.File?item=UGFyZW50SUQ9M...
[2] https://www.ft.com/content/981f7084-c515-11e5-b3b1-7b2481276...