Hi , I have a regular fido line that I am using on my nokia 6020b IMEI : 355372002745846. I renewed my contract and got for free a new SonyEricsson phone. I put my regular line in the new SonyEricsson phone and it works. Now here's the problem: I bought a new prepaid line (I got a new SIM) from fido but when i insert it in my nokia i get "enter restriction code" message. I tried to insert the new prepaid line in the new sonyericsson and it worked!!! which means that the SIM card is not defective but for some reason it would not work on my nokia 6020b. Can anyone help? thanks