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Nokia,the worlds largest cellphone maker,has started its first tests of a technology that allows users to roam seamlessly between phone networks and local wireless hotspots such as Wi-Fi.Fifty families in Oulu near the polar circle in the northern Finland will test the technology over the next two months,Nokia said on thursday.Mobile subscribers with handsets enabled for so-called unlicensed mobile access,or UMA,can make calls over the internet when they are in range of an unlicensed wireless network such Bluetooth or Wi-Fi.When they move out of range ,the connection will automatically revert to a GSM,GPRS or UMTS mobile phone network.The technology has the advantage that carriers can add coverage,for example in remote areas,at low cost with Wi-Fi hotspots instead of having to build expensive base stations.It could also encourage customers to use mobile phone at home instead of using landline connections,if they have Wi-Fi at home.!