I am traveling in Qatar and my BlackBerry won't see the Sim Card. I don't think it activated before I left or something. I can switch it from global to GSM back and forth, but when I set it to Global it just says insert sim card and won't find it. When I go to settings and then advanced I go to SIM CARD and it says there isn't one. So I removed it several times and put it back in, but still doesn't see it. I need to have this phone if at all possible! If anyone has any help, I would greatly appriciate an email! 
You have to call the Global Travel service and have them activate your card. They can be reached at US (800) 711-8300 and it looks on the map like the entirety of Qatar is covered and will cost around $3/min.