I Just Got my I phone 3g unlocked But the Sim card that came with it does not work i got the phone off web site call www.cell2get.com that has unlocked cellphone. But the sim card that came with does not work and from different web site called (http://www.link2cheap.com) it is under the unlocked sim if you click it It say This is the sim that could unlock your Iphone 3G modem firmware 02.30.03. Until now, this is the only method could unlock it in the world. It also compitable with iPhone 3G previous firmwares. But we suggest you to do a free soft unlock for other than firmware 2.2.1. * *search quicksn0w or yellowsn0w to find out how to unlock your firmware 2.2 by software. Do i need a sim card from At@t so it can work? i think it is a modem firmware but when i put it in it say no signal and i can not make calls or text? Is it Different from firmware or do i need both AT@T sim card for both to make calls and text? Edit if you look at the picture the instruction on the back say this step 1. The Sim is vulnerable Please read the usage before installation to Avoid any damages Step 2 take out the sim and put it into the sim tray alsong with your mobile phone card pinned the Gevey Sim Step 3 Insert the Sim Try your sim and Gevey sim into your i phone. If you feel the sim tray was stuck do not push it Heavily shake the sim tray slowly to go through Step 4 Power on you i phone until the signal appears. Wait until it is stable and you can use it normally if you need to use GPRS or EDGE please turn of data roaming i did all the steps but it say no signal? i think i need both At@t Sim card and the modem firmware so it can work? Or Will it work?