Hi
I realise there are a lot of people out there that have problems with their
Iphones and would like to get some help, which I why I really appreciate anyone who takes time to read and hopefully help me out with my problem.

What I have:
Iphone bought in the UK on o2
04.02.13_g - Iím guessing version 1.1.2

What Iíve done so far:
Downgraded the firmware to 1.1.1 using a firmware file called

iPhone1,1_1.1.1_3A109a_Restore.ipsw

Iíve Jailbroken that firmware... works fine... except when I try to slot my
PREPAID o2 Sim card in I get a dot in the upper left corner and 4 smaller dots after that. This stays there for a few minutes until the message 'No service' appears. If I try to dial a number I will get a message saying 'Call Failed'.

The simcard I am using is a prepaid one which isnít activated yet so I cannot call out with it but I am supposed to activate it by calling '4444' so I guess I should at least be able to dial that number. I havenít got another phone unlocked to o2 so I canít try it to be sure but it shouldnít be a problem. When I slot the sim card which came with the phone into it, I get the same thing but thatís expected as itís not on contract or activated.

Is there a separate 1.1.1 firmware for the US and the UK? If there is, is that what is causing my problem? Or can I only use an o2 sim on the 1.1.2 firmware?

Thatís my first and main problem. The second is when I try to upgrade to 1.1.2 .
I follow all the instructions and I donít have any issues on the way. When I get to the stage where the phone is being jailbroken and it restarts by itself (or some people tell you to reset it) ... it does... but it reboots with the lock and Iím back to square one again.

The instructions Iím following are from
[ame="http://uk.youtube.com/watch?v=zDN_wA8ooYE&feature=related"]YouTube - How to fully Downgrade, Jailbreak and Unlock iPhone to 1.1.2[/ame]

Iíve tried to repeat the whole procedure twice but I get the same result. At the moment my phone is 1.1.1 so that I can at least use the features... but still not the phone.
As you can see Iím a bit of a noob but I still understand most of the technical terms.

Please give me some advice if you can on what I should do.

Again... any help is very much appreciated.

Thanks

Alex