Very strange - no signal after jailbreak, even if it is factory unlocked?

I have a big problem with my iPhone 4 (8GB). I got it from Switzerland, but I'm using it with a UK sim. What I thought it was FACTORY UNLOCKED, since it immediately found my carrier even before asking to activate the phone. (I also checked on Free iPhone Operator Check By IMEI, and it is UNLOCKED.) But I couldn't activate it just kept saying that "The SIM card inserted in this iPhone does not appear to be supported" blabla… I was wondering why…

So I decided to give it a try and jailbreake it with the latest redsn0w (hacktivate). I jailbroke it, everything went flawless, I could use it without any problem. Before the battery depleted the only program I tried to install from Cydia was "iphonedelivery" (don't know if that matters anything).

Anyway, the battery depleted, then I charged it, turned it on, and ever since it says "no service". What can I do now? I have restored it from iTunes, Jailbroke it again with redsn0w, with no luck. If I restore with iTunes, there's "no service", and it should still be activated (with a proper sim), or if I jailbreake it with redsn0w, it is working fine but I can't use it as a phone, since still "no service". What am I doing wrong?

It came with 5.1.1
model: MD198FD
Baseband: 04.12.01

What can I do now? Any any any ideas are really appreciated.

Restore clean iOS 5.1.1 on it. Then apply an unlock and jailbreak it again. Follow this guide:

http://unlockboot.com/2012/05/unlock-ios-511-on-your-jailbroken.html

Hope I helped!

There's a site that I know about that does everyday giveaways. The site is itunesgiftcard.blogspot.com

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