DO I Upgrade?? 3.1.3->4.x?

[jpascone]

I am currently running 3.1.3 (7E18) with 05.12.01 Firmware on my jailbroken 3GS.
My question is should I upgrade to 4.X?? Or moreover will I lose any functionality by moving to 4.x? If I do move which version of 4.x should I upgrade to and what is the best method to get me there? Thanks a lot, sorry for the noob questions.

[Cowboy]

Your phone will be fine on 4.xx firmware. DO you have any shsh saved?
Also do you need an unlock?

[jpascone]

According to Cydia I have 3.1.2, 3.1.3, 4.0, 4.0.1, 4.0.2 and 4.1? At least this is in green across the top of the screen.

When you say "Do you have an unlock". What do you mean? I do not use this with another carrier if that was your question..

Which version of the OS should I go to and what is my best route? There seem to be so many options.

Thanks!!

[Cowboy]

I would upgrade to 4.1 and jailbreak with limera1n.
Download 4.1 ipsw
Use tiny umbrella as a tss server and click shift alt restore
Select your firmware
And do the restore
use tinyumbrella to kick you out of dfu then jailbreak with limera1n

[iYeow]

Follow Westerman guide if you don't need an unlock, it means that if you are using the official carrier for your iphone.

[Cowboy]

Thanks iyeow

[jpascone]

Looks pretty straightforward, just curious why I would go this way vs. jailbreakme?
Thanks guys!

[Cowboy]

First 4.1 is just a smoother firmware then most of the others. Second jailbreakme only works on 3.1.3,4.0, and 4.0.1

[pratt1503]

Jailbreakme is the easy option, but the guide Westerman has given you is easy and 4.1 is a better firmware IMO