I often use a device known as Pressure Trace II (PTII for short). It also uses a BlueTooth interface between the PTII and my Windows PC. When I connect to my my SpeedTracker (ST for short) I find that either the ST becomes intermittent, or the PTII becomes intermittent, or both become intermittent. The problems continue even if I remove all other BT pairings from the phone. This is normal for BlueTooth devices as BlueTooth (BT) is a poor communications protocol and many Op Sys have a hard time maintaining more than one BT connection at a time. I have noticed that I can even get interference if I leave my automobile BT active at my open range. What are the chances of a firmware update that would allow the ST to connect by a USB cable to the phone?