I believe, you will have to go to dealer to activate alarm, or an independed shop, specializing in BMW. But, where are you going to go if your alarm kicks in in the middle of the night for no reason?
I am surprise, to read, that you have motion detector, bot no siren...
This means you do not have have alarm installed... or at least the audible portion of it. Is there a tilt sensor in the trunk behind lining on passenger side?
As far as bluetooth goes: yes this can be installed, I am pretty sure it is not installed, unless you ordered it specifically. The ULF (bluetooth) needs to be activated by a dealer, like alarm. Make sure your particular phone is bluetooth compatible, it has nothing to do with your cell service provider.