** Vodafone Group shares up 1 pct after Citigroupupgrades to "buy" from "neutral"; among top gainers on FTSE 100
** Broker says potential debt and hybrid funded deal to buyUnitymedia would add 12-15 pct to co's free cash flow
** Vodafone trades on an equity FCF of 7.9 pct and a FCF tofirm of 5 pct in FY18 which will rise according to Citigroup'sforecasts to 9.3 pct and 6.5 pct in FY22
** Says markets remain competitive but
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** Brokers bullish on stock with 19 of 25 rating it "buy" orhigher