iPhone 4.0.1 or 4.1 Help

Today i bought the iPhone 4, just out of its box. I want to jailbreak it. (lol). Ive jailbroken my iPhone touch 3g on 4.1 with limera1n. Everythings working fine.
My question is, do i upgrade to 4.1 and jailbreak, will my baseband be ok or whatever. Or do i stay on 4.0.1 and jailbreak that to perserve my baseband or somthing. I dont need a Carrier unlock.
Answer #1
How to JAILBREAK Your iPhone 3GS, iPhone 4 Using Limera1n – iPhone 3GS, iPod Touch 3G, iPad, iPhone 4, iPod Touch 4G – (iOS 4.0, 4.0.1, 4.0.2, and 4.1)
http://www.google.com?t=7025518&highlight=
How to JAILBREAK Your iPhone 3GS, iPhone 4 Using Greenpois0n – iPhone 3GS and iPhone 4 – (iOS 4.1 firmware)
http://www.google.com?t=7053089&highlight=
If you update FW you will also update BB ( baseband )! Also if you need help PM me!
Also you can check this…
http://thefirmwareumbrella.blogspot.com/2010/09/tinyumbrella-with-41-support.html
Answer #2
Upgrade from 4.01/4.02 to 4.1 without ssh and preserve baseband success ! Upgrade from 4.01/4.02 to 4.1 without ssh back up and preserve baseband success !
I just manually upgrade my iphone 4 from 4.02 to 4.1 without update the baseband .
Here is what I did. TESTED , CONFIRMED
1. Download the ios 4.1 Firmware 2. Put the phone to recovery mode
3. Manually hold the shift button and restore the downloaded 4.1 firmware
4. ITUNES will give u the ERROR 1004 ( DONT WORRY, U ARE ON TRAIL)
5. Downloaded the latest Tinyumbrella from The Firmware Umbrella
6. connect the iphone to the computer and click the Tinyumbrella.
7. wait for a min, and click the “kick out of the recovery mode”
8. Activated the phone 9. GO to setting –> general –>about and you will see that u are on ios4.1 and baseband 01.59.00
10. Now use limra1n or greenposi0n to jailbreak
11. click the ultrasn0w to unlock DONE!!!!!!!!!!!!!! CHEERS