How do I find out if I can do that on my phone? When I go to the messages and press the BB menu, it doesn't show 'compose mms message' -- Does this mean it's not allowed on my phone?
Nope!
Just like I can't use true GPS on my BB. It's there, but Verizon wants us to pay for Vznavigator so the lock down our ability to use the gps function.
Will people that don't have BB's be able to send me picture messages?
Since you don't have mms per say, not directly. You will get a message, but there will be a link to a site to view this. This is how it works with Verizon. My buddy has an 8830, no camera, so he can't do mms. And when I sent him one it gives him the link.
They can email you the picture.