Up to 15 jobs could be at risk as telecommunications giant Vodafone moves some roles from Belfast to offices in England.
The Northern Ireland jobs are in customer services and the company's retail outlets here will not be effected.
Other staff in Belfast city centre will relocate to Dundonald.
Vodafone has retail shops in Londonderry, Coleraine, Ballymena, Bangor, Newtownabbey, Lisburn, Newry, Craigavon and two in Belfast, at Victoria Square and Forestside shopping complexes.
A spokesman said: "In line with our strategic focus on looking after our customers from centres of excellence, customer support and services currently handled from Vodafone's offices in Belfast will move to our contact centres in Newark and Stoke on Trent from March 2013.
"Other activities currently carried out in Belfast will move to the Cable -amp; Wireless Worldwide offices in Dundonald as part of our integration plans following Vodafone's acquisition of C-amp;WW in April 2012.
"There are no current plans to make any changes to our retail stores in Northern Ireland."
Vodafone also employs around 1,300 people in Dublin and Dundalk. The firm first entered the Irish market in May 2001, after acquiring Eircell in the largest deal ever in Irish corporate history.