Here one video reviews from youtube for the att blackberry curve 8900,
check it..
BlackBerry Curve 8900 YouTube video:
ATT BlackBerry Curve 8900 video
How to install blackberry 8800 sim card
At & t blackberry 8000 questions, blackberry 880 sim card;
How to install att t blackberry 8800 sim card,

Not a studio question at all, someone asked about how to install the blackberry 8800 sim card on the answer yahoo.com and here it is the answers from offical support page:
Answer:If you want to Remove or Insert the SIM Card for the att BlackBerry 8800,you must Turn the power off on the handheld before inserting or removing the SIM card. Failure to do so may damage the memory contained on the SIM card. AT&T Cell Phones Faq
1. Press the batter cover release button.
2. Slide off the battery cover.
3. Remove the battery from the battery well.
4. Remove or insert the SIM card into the holder with the metal contacts facing down.
5. Replace the battery and battery cover.
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