I think it's correct that RV 760 will link both iPhone and Android, whereas dezl 760 is limited to Android 2.1> OS. You must have a subscription added for it to work as you've noted. See P11 of the manual to confirm:
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The charger/TMC receiver may not be faulty at all, a bit like lightning striking twice to get 2 dud GTM36. It could be that the unit's USB connection is problematical. It this device within warranty?