Here's your one-stop thread on everything to do with your k750i phone:

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Advanced camera usage
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1 = Opens menu with "picture size" ready to select
4 = Toggles Macro mode (for close up photos)
7 = Toggels Night mode
* = Toggles Light (I also find this is the fastest way to use the light as a torch in the dark)
0 = While in video mode toggles length of recording.

Mute camera sounds; Before opening the lense cover hold # to toggle between silent mode easially.

Change brightness = < or >

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Secret Menus / Codes
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Service menu = >*<<*<*
Lock status = <**<
IMEI number = *#06#
Access contacts on sim card = Any nubmer then # (e.g. 9# to go to 9th entry on sim card.)
Phone status = Either volume button

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Light up clock in standby mode
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Press the volume button

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Mute a phone call without rejecting it
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Press the volume button

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Hidden Smileys
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:-]
:-[
[:]

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Don't Drain The Battery
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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/

In response to lots of questions about the battery, I've explained things in greater detail on page 4 of this thread.

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Remote Control
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I only just discovered what the remote control application is capable of, so I think this is worth a mention for those of you that might have thought nothing of it... I've used the SE developer tools to customize a remote for winamp, easier to use than windows notepad! I've also made a shortcut pointing to C:/WINDOWS/system32/shutdown.exe -s -t 5 -c "K750i Bluetooth remote command" which is a network command to shut down the computer after 5 seconds. If you put the shortcut in the start menu somewhere, you can assign a shortcut key to execute it e.g. CTRL+ALT+0. Which in turn you can program your remote to use on one of it's buttons.