The British mobile phone giant posted a loss of 6.3 billion euros (USD 6.9 billion) for the 12 months to March, after a net loss of 5.4 billion euros in the previous financial year, it said in a statement.
The loss was driven by taxation changes and a 3.7-billion impairment at its Indian division - which Vodafone is spinning off into a joint venture.
However, underlying or operating profit excluding exceptional items almost tripled to 3.7 billion euros on cost- cutting - and a solid showing in Europe.
"Our focus on excellence in customer experience has enabled further improvements in our overall commercial and financial performance during the year," said chief executive Vittorio Colao.
Sales declined 4.4 per cent to 47.6 billion euros on adverse foreign exchange movements.
Vodafone is the world's second-largest mobile-phone carrier in terms of subscriber numbers, trailing global leader China Mobile.
In the first half, Vodafone initially took a non-cash impairment of 5.0 billion euros on its Indian activities and blamed a sharp increase in competition.
Following the deal, Vodafone added today it had partially reversed the Indian impairment - but it still stood at 3.7 billion euros.
Colao has sought to reshape the business following his appointment in 2008.
The group offloaded its 45-percent stake in Verizon Wireless in 2015 for a colossal USD 130 billion, one of the biggest transactions in global corporate history.
In 2016, Vodafone sold its Dutch fixed-line business Vodafone Thuis to Germany's T-Mobile for an undisclosed amount.
And earlier this year, Vodafone announced the creation of its Indian joint venture.
Russ Mould, investment director at AJ Bell, told AFP that the Vodafone boss had brought "clarity" to the group's overall strategy.
"Colao has brought greater strategic clarity to Vodafone, focussing its mobile activities in markets where it either was or had the potential to be top-ranked player, using joint- ventures to augment the company's competitive position in India and the Netherlands, and investing for the long-term so the firm could maximise the potential of 4G and eventually 5G services," he said.
"A messy set of full-year figures today offers some grounds for optimism on an underlying basis.
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