Mobile VoIP service Truphone has raised a big £16.5 million in second-round funding from its existing backers, led by private investors. Independent News & Media and German publisher Burda’s digital VC arm are amongst them. Working from a converted barn in Kent, Truphone is mobile software that routes phone calls over the internet for cheaper rates and makes WiFi-to-WiFi free. Founder James Tagg stated the obvious: “The capital will enable us to structure and focus our business to ensure that everything we do contributes towards the achievement of our aims.” Truphone raised a £12.5 million round back in December 2006. It this month bought Sim4Travel to create a proto-GSM network. Release.