New Sim doesnt work in unlocked iphone 4 - shows "no service"

Hi all,
I am locked into a UK contract with my iphone 4. I have just moved abroad (Belgium) and want to be able to use the iphone over here with a new sim. I've unlocked the phone, so it now recognises the sim but it still says "no service", even when i know that there is service...
Someone mentioned jailbreaking - is this something i need to do/get done?
Thanks

If its anything like Australia you can have the phone unlocked for free even while on a contract. They simply don't care anymore so long as you keep paying your contract.
I use multiple sim cards for various parts of the world that i commonly travel to to keep costs down.
I would advise to call your telco again and have them resend the unlock sequence again (its a long path from telco-apple etc).
In AU the telco even sends an sms advising of the unlock completion.
Also make sure you do a full power cycle for the unlock to take effect.
Cheers!

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