hi guys am new to the whole android thing, i have the sony ericsson xperia x8. one thing i got told was to download the advanced task killer, anyways everytime i kill the apps and games i dont use it makes my signal go off for about 15 seconds then back on again, which i dont mind. the thing that is bothering me is the service tone, it gets realy annoying, i have tried to see if i can turn it off but it doesnt say anything in the user manual. any ideas? or could it be the type of task killer i am using?