Interphone and Zumo 660
I'll try and help here, but if you want to email or phone us direct that's fine.
You must download and install the latest BT firmware from Garmin for the Zumo (via 'webupdater') before you start - they like Interphone so much they mod the firmware to work better with it!
What is the BT sw version of the Zumo by going to Tools>Settings>System>About>Software Version
The latest version is 3.30
The critical thing is to pair everything in the right order;
1. Interphone to Interphone (and remember which one you set as 'master' = volume up button) Then make sure that they connect correctly. If not, repeat until they do. If you're still having problems, either one of the units is faulty, or you aren't following the instructions exactly. In either case, give us a call and we'll talk you through it. Sometimes it helps if the first time they connect you initiate from the master - after that it shouldn't matter.
2. Master to Garmin Zumo
3. Phone to Zumo
Pairing is always quicker and more reliable if there isn't a lot of other BT noise around when you first do it - so switch off any devices that you aren't pairing at that moment.
It also helps if you delete all old relevant but redundant pairings from Zumo and phone before you start.
Also, check on the Zumo that Interphone (= STMOTO) only appears in the list of paired headsets, and not as a phone. If it appears on the phones list just delete it.
If you're still not happy give us a call.
(we only want happy customers

)
BFN
Malcolm