Dow Jones Newswires reports that MetroPCS Communications’ chief executive Roger Linquist believes there could be some “roll-ups,” or mergers, soon taking place in the wireless prepaid phone service industry. MetroPCS, long rumoured to be trying to merge with fellow prepaid provider Leap Wireless International, could be one of those companies, notes the report, but Linquist declined to comment on his own company’s merger activity.