Hi there, it has only one base set and one handset. Unfortunately I don't have another phone to test the line, but seeing as I can hear callers perfectly well (it's only them that can't here me) I think we're safe to assume it's the handset.
Hi there, ok yes I will get a neighbour's phone on Wednesday evening as I fly tomorrow morning for a 3 day business trip. The service provider is UPC. Is there anything else I could do/try tonight to see if that works before I do the test on Wednesday?