Each section will provide a different method and you got to choose any one of them depending upon your exact problem.
If your phone has not been jail broken and it is in a normal condition and you are encountering i Phone 3G error 1015, then you need to go through the steps mentioned below in order to fix it. You can choose any of the two methods described above.
Technically with this procedure you are restoring the old i Phone state, and are not really installing the old i OS version over the new i OS version, but the result should be the same.
If you do not have a previous system backup in the "i Phone Software Updates" folder, grab the latest version of i OS 3 for the i Phone 3G at this Web site (it is specifically the one called "3.1.3 (3G): i Phone1,2_3.1.3_7E18_Restore.ipsw") and use that to restore your i Phone 3G.
Apple recently released an update for i OS to address the location-tracking issues that had, and still have, a lot of i Phone users up in arms.
Looking at #1 above - the best advice is to reseat the SIM card and then try again to make sure it wasn't a timing or contact alignment issue.Instructions are the same to jailbreak the i Pod Touch 2G. One of the most common issues is that the Cydia icon appears all white.Step 1: Make sure you have the latest version of i Tunes installed (i Tunes 9.2). The user is left staring at their phone as nothing happens – no mail is downloaded, the browser won’t load pages, and so on.The article notes that only the i Phone is affected and that there are ways to deal with the issue.