There's also a note on the Three website http://ask3.three.co.uk/srvs/cgi-bin/webisapi.dll/,/... http://ask3.three.co...bile:mobileUser Three Three "Pay per day" Add-on voicemail security this page have no support for Linux only available http://ask3.three.co.uk/srvs/cgi-bin/webisapi.dll/,/... security pages on its website 3 Mobile http://ask3.three.co.uk/srvs/cgi-bin/webisapi.dll/,/... One Plan security pages on its website