Can S60 keep certain services running in the background like iPhone OS4? (voip, downloads, streaming, music playback, gps access) The true power drain of 'multitasking' depends on what the background apps are doing. If you just load 50 apps that does nothing, all they do is drain your swap space. The 3GS and N900 has very similar spec. Cortex A8 with 1300-ish mah power source, similar sized screen, wifi and 3g. So they have similar 'power drain' centers.