Why does your cell phone network fail inside Delhi Metro? Here`s what TRAI probe found
The TRAI conducted an extensive drive test across the Delhi-NCR metro network and the Delhi-Meerut RRTS corridor and covered nearly 490 kilometres.
Top Stories India 
The TRAI conducted an extensive drive test across the Delhi-NCR metro network and the Delhi-Meerut RRTS corridor and covered nearly 490 kilometres.
){kind=small}
