rite i know ive asked similar questions but nothing is working

i have a 1.1.2 otb iphone
i downgraded to 1.1.1 and jailbroke it.
i then intalled oktoprep and upgraded to 1.1.2 then i jailbroke again.

this method works perfectly for me, i get signal and everthing works but i think i prefer the v1.1.1

so i did a full restore.
downgraded to 1.1.1 and then jailbroke.
but for some reason when i do this i get no signal (i cannot use any of the phone features), it doesnt seen to register the sim.(i am on o2)

can anyone point me in the right direction please, help would be much appreciated.