im in ireland bought second hand iphone in dublin iv jailbreaked the iphone 4 with green pois0n redsn0w_cydia phone is on 4.2.1 baseband 30.10.01 i know theres no unlock for that yet.. ok thats all fine but the phone is on irish o2 orginaly and i put my new activated o2 sim in it and theres noting coming up no bars in carrier it says "not available" the o2 sim works because i had it in another phone with no bothers i rang apple gave them the imei they said its definatly on the o2 network model is MC603B(its real factory unlocked i think)) and the phones not blacklisted its doing my head in how come it wont reganise the irish o2 sim card
Try these steps in order to activate http://www.ihelplounge.com/ihelplounge/2011/02/activate-iphone-without-the-original-sim-card.html
