Is near any free course to unlock/jailbreak the iphone 3g or not nonetheless ?

Answers: there is but it takes a long time to do it

http://pdfcast.org/pdf/unlock-iphone-gui...

This guide will allow you to effortlessly activate and unlock your brand new iPhone running Firmware 1.1.1. Don’t verbs if you’re not sure which Firmware your iPhone is running. The steps to find out which Firmware you are running are at the beginning of this guide.