Australian start-up Freshtel today said it expected to launch a voice over internet protocol (VoIP) service for mobile phone users within weeks, after a successful trial of its dual-mode technology with UK supermarket giant Tesco. After many months of testing, Tesco’s telecoms arm Tesco Telecoms has launched a service that allows owners of approved Nokia dual-mode mobile handsets to make cheap internet calls when within the boundaries of a Wi-Fi network. The Tesco Talk Wi-Fi service, developed by Freshtel, can be launched via a simple SMS message and offers any UK mobile phone user 10 pence per minute calls to mobiles, with landline calls, including international numbers, as low as 2 pence per minute: so long as the user is connected within a Wi-Fi network. Calls made via a Wi-Fi network are charged to the user separately to the bill they receive from their regular mobile carrier. ‘When you fall outside the Wi-Fi zone, the phone falls back on your regular GSM or 3G service,’ a Freshtel spokesperson explained.