Hello! I bought a gevey sim and when I try to use it on my iphone 4, it doesnt work UNLESS I restore to a factory firmware, then it will work once until you reboot it. By not working, I mean it goes through all of the steps but when it goes to connect to the network after the no sim card installed message, it gets bars but never says "T-Mobile' then after about 30 seconds of this, it just says "no sim installed" then "sim failure". This is my second gevey sim, and my first one was doing the same thing! I have no idea what I am doing wrong. During the 30 seconds where it does have bars it shows the little "E" for edge but then it just quits. I can also call and get calls during that time but when it shows the "sim failure" the calls just fail.