 Costs will remain Vodafone Group PLC LSE:VODs focus, according to analysts at Citigroup, particularly given inflation in energy and wages ahead of its half-year results in November Analysts at Citi believe that significant volatility will remain a feature into next year. Vodafone remains committed to portfolio optimisation, said Citi, with Vantage being central to the companys value crystallisation and deleveraging efforts. 