IOS 5.0 iphone 3GS will it work?

If I upgrade it to iOS 5.0.1 can I untether jailbreak and unlock it?

Jailobreaking doesn't mean that you can unlock it, you need to have certain baseband in your iPhone to unlock it.
Go to this web site here and read a little: http://www.ijailbreak.com/how-to-unlock/
And her it explain which baseband can be unlock and how to: http://www.ijailbreak.com/cydia/unlock-iphone-3gs-with-ultrasn0w-1-2-5/

Sure

Yes you can.

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