Can it be unlocked? 3.1

[hack-a-shack]

Below are my phone's specs. I am wondering if it is possible to unlock the phone. Also, would unlocking require tethering on startup, or is that just for jailbreaking. Thanks!

Serial number: 84939-xxxxxx
Name: iPhone 3GS
Group1: iPhone
Group2: 3GS
Generation:
ModelCode: iphone_3gs
Problems: Many of these phones have a yellow tint on the screen. Please tell us if this phone does or does not suffer from that.
CPU speed: 600MHz
Screen size: 3.5 inch
Screen resolution: 480x320 pixels
Colour: Black
Capacity: 16GB
Factory: 84 (Shenzhen, China)
External link: Technical specifications by apple-history.com
Model introduced: 2009
Production year: 2009
Production week: 39 (October)
Production number: 30942 (within this week)
Uitbreidingen: Uitbreidingsmogelijkheden van dit apparaat

running version 3.1 and firmware 05.11.07.

Any help is appreciated. What program would I use?

 

[Applejuiced]

Yes.

 

[hack-a-shack]

What program should I use?

Would this be an untethered unlock?

 

[iphone1105]

Would this be an untethered unlock?

Theres like maybe 6 or 7 pinned threads at the top of the forum, no need to ask just look in them, all your answers are there.