I have been a Vodafone user since 2004(when it was Hutch). The quality of network has progressively deteriorated over the years. Over the last 1 month we have been facing frequent signal drop whenever we receive calls on our mobiles in our residence. Interestingly the signal is clear once I just step out of the main door. If this was an exceptional case.
I faced similar problem when inside a huge Corporate Office complex in Mumbai. Interestingly that is belonging to one of Indias largest conglomerates and there is no problem with any of the other mobile operators. This is something the employees themselves acknowledge! The Signal issue is quite poor even at the domestic airport in Mumbai! I have reported this issue to Vodafone through calls, Twitter frequently but there has been no progress till date!:-(.
Either they are indeed very poor in their network service or they just dont care. Either way it is bad!