In a move that may cast fresh doubt over the next-generation mobile phone business, J-Phone Co. said Wednesday it will postpone its launch of third-generation cellular phone service again from June to December.

It is the second delay in one year for the company, owned by British giant Vodafone Group PLC.

The cellular operator said J-Phone had to make software changes to its 3G technology to comply with the latest version of an international technology standard, which was updated in March.