Thank you ! i am a newbie for i-phone 4. can you guide me how to get the correct gevy sim and instructions to install it?

i am having 4.3.2

Hello, i got "invalid sim" and "sim card failure" message after unlocking my i-phone 4 using the ultrasnow. i tried rebooting it several times, it doesnt help i tried reseting network settings, it doesnt help modem firmware : 4.10.01 i tried sim card in another phone, it works. Thanks for...