If you, like me have an iPhone and can’t use the VOICEMAIL button for anything, then read on.
You can change the button to call a predefined number by issusing the following call:
*5005*86*xxxxxxxx#
and then press CALL.
Change the xxxxxxxx to your voicemail number or .. your mother 
If you wanna find out which firmware version you have on your brand new iPhone before trying to unlock it, try the following:
03.12.06_GÂ = firmware 1.0.0
03.14.08_G = firmware 1.0.1 and 1.02 (as they both have the same Baseband firmware)
04.02.04_G = firmware 1.1.1
If, you like me, has an ipod with a cap limit (=all iPods sold in the EU) then you can remove it by using the following program:
http://www.randgruppe.info/ipod/iMod_new_12-05.rar
Note: Cap limit is a function that limits the amount of sound that you ipod can send to your earphones. This is done to protect your ears. But in my case, while driving my car I have to turn my car stereo up to where it starts to chop the sound, especially while hearing podcasts.
W A R N I N G !
In any case, cap limit or not, you should be aware of ear-damage.
Remember: you only got this two ones.
If you can’t heare with them anymore - the ipod is worthless!
Do not turn the ipod louder than needed!
More info @ http://www.randgruppe.info/ipod/