Hundreds of call centre jobs are at risk after mobile phone giant T-Mobile announced plans to move work to the Philippines.
More than 500 workers who are employed by firm Telecom Service Centres (TSC) are affected by the decision.
Around 300 staff out of 500 at a TSC call centre in Larbert, near Falkirk, 118 at a centre in Greenock, Renfrewshire, and around 100 at a TSC call centre in Yorkshire are at risk.
A spokesman for TSC, which provides contact centre services and technology support to T-Mobile, said the company had started a 90-day consultation period with staff.
The mobile phone company confirmed plans are under way to transfer work from TSC to a new centre in Manila, in the Philippines, known as T-Mobile Dela Rosa.
A TSC spokesman said: "One of our clients has decided that certain services we currently perform for them will be moved to an offshore supplier. Sadly, that puts at risk a number of jobs in our Falkirk site - hence the beginning of the consultation period."
But he stressed the company was "working very hard" to attract new business to the call centre. We have a number of potential new clients in the pipeline - and we will do all we can to try to secure this new business," he said.
"Our Falkirk operation has been an integral part of the TSC network since it opened and we are determined to do all we can to keep our staff members there in employment."
A T-Mobile spokeswoman said: "This decision will result in a gradual transfer of services from the current provider TSC."
Plans involved transferring some areas of work to the Manila call centre by the end of August, she said. The "more complex aspects" of the operations would remain in the UK.
