I have the same issue with mine, pulling the sim didnt work. I had this issue before when I was running stock and had to get a replacement handset. I've only had this replacement for about 2 weeks so I guess I'll try reflashing to stock and if that doesn't work I'll beg them to give me a different handset
EDIT
I reflashed to stock and 4g came back so i reflashed to ICS and rooted and 4g is running again as it should. I think the issue was changing to CMDA with the turn of LTE app. I will probably just stay away from disabling LTE since this may have caused my 4g failures in the past.

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