Mailing the story:

Google has strengthened its mobile services with the debut of a service called Voice that could be a challenge to Skype and other phone firms. It lets customers make cheap international calls and gives them a speech-to-text feature for voicemail. The services are available thanks to Google's acquisition of phone firm GrandCentral which gives users a lifelong universal phone number. "This could be big. Google is seen as disruptive," said analyst Jon Arnold.