Telecom sector experts have raised concerns over Vodafone Idea's declining capital expenditure in absence of external funding and the operator's ability to strengthen its network to compete with rivals Jio and Bharti Airtel. During the September quarter, the telco's capex fell 28% to Rs 1,750 crore, sharply below analyst expectations of around Rs 2,600 crore, and marked a steep decline from Rs 2,440 crore in the previous quarter, according to reports from UBS, JPMorgan and Axis Capital.