At Firmware 1.0.2 the unlock solution AnySIM 1.0.2 was used a lot. The solution works for 1.0.2 but caused damage to the seczone and you might end with a brick if you try to upgrade.
Two szenarios:
1. Get back Installer and stay with firmware 1.0.2
You must have OpenSSH and BSD Subsystem installed on your iPhone. Dont know if this is the case but it is most likely.
Download the Mac version of Nullrivers AppTapp installer to your PC from
here, even if you are on Windows. Inside the package (folder on Windows) you will find "Installer.app" (at /Contents/Resources). Copy it to your desktop.
To get Installer on the iPhone and working you need an SFTP client. On windows google for WinSCP and download/install it on your PC. On a Mac use Cyberduck or Fugu for SFTP.
On the iPhone setup Wi-Fi. Connect to the iPhone via SFTP (your iPhones IP, root as username and alpine as password) and copy "Installer.app" from your desktop into /Applications on the iPhone replacing the present version.
Restart the iPhone and start Installer then. Dont allow Installer to update itself.
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