Two industry sources told Reuters that the Finnish group, which is struggling to recoup ground lost to its rivals, cut the price of its mid-range Lumia 800 Windows Phone by around 15 percent this week and made smaller reductions on other Windows models.

Nokia shares continued falling on Thursday after slumping 13 percent on Wednesday as the firm unveiled two new Windows Phone models in what may be the last major shot at reclaiming market share lost to Apple Inc, Samsung Electronics Co Ltd and Google Inc.

Nokia did not disclose the price or roll-out dates of the new models - which with their rounded edges and colourful covers look similar to their predecessors - and its share fell a further 4.6 percent to 1.9 euros by 1320 GMT on Thursday.

Research firm CCS Insight, which tracks market prices, confirmed the cuts and said they were necessary to keep momentum behind current Lumia 800 and 900 devices now when new products have been announced using the updated Windows Phone 8 software.

The company did not officially disclose the price cuts of the older phones but said such steps were a normal part of its business.