Hi there, hope some sifus will be kind enough to answer my question

I have a Maxis set iphone 3GS and i wanted to jailbreak to install apps & games, it has the 3.1.3 firmware & 05.12.01 base-band. here's my question.

1) Is it possible to jailbreak the current 3.1.3 without touching the firmware since it's already unlocked? Or I have to follow the step to download & restore the FW and jailbreak ?

2) If i have to restore the FW, if everything went fail, can I revert it back by restoring the original 3.1.3 FW so everything go back to it's original state and remain UNLOCKED?

3) Lastly, i'm kinda confuse, to make it simple. I just wanna confirm that do I have to unlock every time I upgrade to higher firmware since it's maxis official unlocked set? or I just have to do the jailbreak process enough?

Thanks & Regards..

My bad as I didn't notice there's a thread like this. So I put my question in "Ultrasn0w/Blacksn0w for LOCKED iPhone 3G/3GS..." thread and thanks to moderator who moved my post in here.

really cleared my confusion & doubts. which mean I can dare to try on my phone now.

Thanks & Regards.