Mobile phone giant Vodafone has announced 65 jobs will move from a satellite office in Newbury, Berkshire, to a new site in Staffordshire.
Vodafone's contact centre in Trowbridge, Wiltshire, will also close and staff moved to the centre in Stoke.
The changes will take place by June 2012. Employees who do not wish to relocate could face redundancy following a period of consultation.
Vodafone's UK headquarters are based in Newbury, employing about 4,000 people.
Attempts will be made to redeploy all staff, the company said.
"Today's changes are about creating a lean and fast-moving organisation," said Abi Bown, of Vodafone UK Customer Services.
"We also want to ensure that people impacted by this are supported to find alternative roles, and that we give them as much notice as we can."