Vodafone shares slump as headwinds grow in key German market Tech Vodafone shares have plunged more than six per cent in early trade this morning after the FTSE 100 giant reported its third-quarter results. While the group reported overall service revenue growth of 5.2 per cent in the third quarter, beating the average analyst estimate of 4.2 per cent, it noted the migration of 1&1 customers [...]