Trying to Jailbreak my iPhone 3GS 4.3.5, is it possible?

[Shought]

Hi guys, I am trying to jail break my iPhone 3GS on 4.3.5 but I can't seem to find anything that works!

I only want to jail break in order to tether as for some reason 'GiffGaff' do not let you tether.
Is there a solution to not jail breaking but able to tether?

Many Thanks

[i.Annie]

If you only want a jb for the sole reason of tethering, well it's not very worth it on 4.3.5. The jb is very buggy and tethered. I'd wait for iOS 5 and a new jb if I were you. But it's up to you. Redsn0w will do the job for you if you want to risk it.

Google for "Redsn0w 4.3.5" and you'll likely come up with a guide and download link.