I too am having trouble connecting with CK3100.
emailed HTC Australia who were less than helpful, with this :-
"Bluetooth should be universal or is marketed as universal although it is far
from the truth. Certain chipsets conflict or are incompatible with others. If a
device is not fully compatible it will not offer all features or possibly not
connect at all.
This is hardware related and not a software issue. This will not be effected by future update for the handset."
Parrot were more use, with this :-
"Hello sir ,
Indeed we notice several compatibility issues with ck3100 and htc touch dual
That's why we haven't listed this phone in our compatibilty list
Our technical engineers are currently on this issue inorder to find the solutions , when it be solved this phone will be listed at this adress below :
Moreover we have several feedbacks from our clients , who informed us that windows mobile 6 works better with ck 31OO software version
if you are intrested you can use 4.15 software version which is in enclosed mail"
Will try when I have time.