As of April 2007, India has 167 million mobile phone subscribers. Out of this, 125  million are GSM users. Needless to say, Mumbai has a number of GSM providers to choose from.

Key among them are:

• Bharti Airtel: http://www.airtel.in 
  
• Vodafone: http://www.vodafone.in
• BPL: http://www.bpl.in
  
• MTNL: http://www.mtnl.net.in
  
• Idea: http://www.ideacellular.com