The main difference in form factors between the 9900 and 9800 - besides the 9900 being much slimmer - is the placement of the hinge on the 9900. It's on the back edge of the phone's side. That's not quite clear in the top picture, but this makes the phone much more comfortable to hold, since you can wrap your index fingers all the way around the keyboard for a good grip.
Although holding it that way really makes you wish they but shoulder button softkeys there.
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The main difference in form factors between the 9900 and 9800 - besides the 9900 being much slimmer - is the placement of the hinge on the 9900. It's on the back edge of the phone's side. That's not quite clear in the top picture, but this makes the phone much more comfortable to hold, since you can wrap your index fingers all the way around the keyboard for a good grip.
Although holding it that way really makes you wish they but shoulder button softkeys there.