iPhone 3Gs - How do I activate my iPhone without SIM Card?

[gncac]

Hello there.
How can I activate my iPhone 3Gs without a SIM Card?
Currently my Phone shows the following message: "NO SIM Card installed. Insert a valid SIM with no Pin lock to activate iPhone"
I am in Portugal, Lisbon and I have tryied SIM cards from the three Carriers operating here but ir keeps showing a message in iTunes saying "The SIM card inserted in this iPhone does not appear to be supported"
Thanks for your help.
G

[xphrozn]

just jailbreak it with redsn0w

[Jahooba]

So you just want to use it as an iPod?