Vodafone Mobile Services Limited is the second largest mobile network operator in India by subscriber base, after Airtel with a market share of 18.42%. It is headquartered in Mumbai, Maharashtra. It has approximately 185 million customers as of June 2015. It offers both prepaid and postpaid GSM cellular phone coverage throughout India with better presence in the metros. Vodafone India provides services on basis of 900 MHz and 1800 MHz digital GSM technology. Vodafone India launched 3G services in the country in the January–March quarter of 2011 and plans to spend up to $500 million within two years on its 3G networks. It has launched its 4G services in India starting from Kochi in Kerala in December 2015 and plans to expands its network to various other cities in the country.