From the man himself (for someone here to help with please?):-
You could do a test to confirm that the BT/DUN connection works well:
* use any of your devices, the original or/and the clone; reinstall the NC with dsa-20July to make sure that folder ppp exists.
* install on an Android tablet or/and smartphone the BlueDUN trial app, and start it - from the moment a DUN connection is accepted, it will work for 5 minutes, more than enough, then it has to be restarted; make sure that the tablet/smartphone is connected to the internet via WI-FI only.
* use Toggle GPRS to switch to BT/DUN (from initially GPRS); tell if LIVE services work, get Connected.
* going back to GPRS requires two more clicks on Toggle GPRS (first moves to No Network, then the second to the GPRS mode)
I will have an interesting conclusion confirmed, if you are successful with the BT/DUN tests.
I forgot to mention that you have to add the tablet/smartphone running BlueDUN as a new "phone" to the TT device, in any mode, just as a hands-free. In other words, the tablet/smartphone address has to get into file settings.dat, otherwise I do not select it when raising the networking.
If you also have another, main phone, as hands-free, you would want to stop its Bluetooth, so to make sure that connection gets faster to the intended BlueDUN device (presumably listed after the main phone, in file settings.dat).