Hi,
First, there is no serial port. It is Bluetooth (RF), not serial (wire), communication.
Second, you are right, doc does not includes UUIDs, will add it there. Any way, wcl.wclUUIDs class includes them all.
If you want to hande connection on SerialPortProfile then you have to use SerialPortServiceClass_UUID as Service's UUID. But you should setup unique name for this service to be possible find the service from your phone (because PC may have other SPP service running). So after detecting it by name you will know its Channel number. Use this channel to connect to service then.