I’d argue the vast majority of customers don’t need anything but their existing phone (corded or cordless ) and connecting that (the existing DECT basestation or the corded phone ) needs no registration to the hub …IMHO , its only the prospect of something for nothing , originally the DV handsets and now the DV adapter that need registration with the hub basestation , and it’s only the fact it’s a freebie that causes customers to ask for these devices in the first place , …..providing these things is nothing more than a rod made for BT’s own back , customers complaining if they don’t meet expectations, no credit if they do …customers of Sky , Vodafone etc are supplied with nothing like this , and are thought no worse for it .
As far as a corded handset appearing as a registered handset , that doesn’t happen , but more importantly does it really matter ?
A possible explanation, perhaps the router was a refurbished one not brand new , and had a DECT handset registered by a previous user , and the refurbishment process didn’t delete that before it was then supplied to a different customer.
