Mobile phone operator EE is to cut 350 head office jobs as it looks to shrink the size of its marketing, finance, legal and account management teams.

The UK’s largest telecoms group said the move was necessary to accommodate the growing size of its sales teams in Derby and Londonderry.

EE, ranked the UK’s best all round mobile operator by independent mobile network analysts Rootmetrics, significantly cut head office jobs when it formed through the merger of T-Mobile and Orange in 2010.

A formal consultation was launched last week for the 350 jobs in question.

Customer service staff in retail and call centres will be unaffected by the consultation.

“As part of our strategy to expand UK-based customer service teams and reach our goal of being number one for service, we need to make changes to our company structure,” said a spokesman for EE.

“Consequently we’re proposing changes to some of our corporate functions. We appreciate this will be a difficult time for the staff affected and we will support them through this period in any way we can.”

EE is currently preparing for a potential floatation or sale, according to the FT.

Earlier this month the company announced plans for a new TV service known as EE TV. The offering is designed to boost customers taking broadband and combined packages of mobile and internet services.

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