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In the six months to the end of September, the mobile phone operator saw the figure rise to £21.8 billion.
The company's cost reduction scheme also began favourably, prompting it to double its target for 2012 to £2 billion.
However, the news resulted in Vodafone shares falling during stock market trading in London, with the price dropping 2.7p to 135.25p at 15:24 GMT.
This was in spite of the firm reiterating its financial forecasts for the full year, stating that adjusted operating profit is likely to be between £11 billion and £11.8 billion.
In addition, it posted increases in adjusted operating profit and data revenue.
"The group has performed in line with our expectations and we have made strong progress with our strategic priorities," said Vittorio Colao, chief executive of Vodafone.
posted by Greg Secker
