The deal is the first time that the operator has recognised a British trade union and follows years of campaigning by Vodafone workers.
Connect will now represent around 500 employees who work in Vodafone’s regional operations. The union will have the right to represent members over issues such as pay, holiday and length of working hours.
Connect general secretary Adrian Askew said: “Our members in Vodafone’s Regional Operations are delighted to finally secure a place at the negotiating table with their employer.
"Today’s announcement will also give hope to people working across the telecoms and IT industry that they can win a genuinely independent voice at work.”