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?