Tricks for w810i and most other SE.

1.Open Note when making calls
During calls, Press More--> Menu-->Organizer--> Note

3.Mute a phone call without rejecting it

Press the volume button

4.Don't Drain The Battery

With Lithium batteries there is no advantage to draining the battery. The battery will infact last longer with partial rather than full discharges. There is no battery memory effect with a lithium battery - you can charge the battery whenever you like without fear of reducing its charge capacity, and you do not need to drain a lithium battery completely before recharging it.Find out more about Lithium batteries here: http://www.batteryuniversity.com/

5.Receiving call

+ or - or # --> mute ringtone
Hold + or - ---> reject call
Hold C to mute/unmute