chairman of tata group ratan tata r unveils the logo of the birla tata att btal idea cellular as the president of btal sanjeev aga applauds during the launch of the cellular service in bombay april 30 2002 btal indias fourth largest mobile phone service on tuesday unveiled a new brand and company name to better reflect its merged identity as it rolls out services to more customers 2d3x5g9.jpg from polski tata rucha córke View Photo