Do they phone you on your landline or mobile ?
The UK passenger locator form requires at least one telephone number. The number(s) can be mobile, landline or both. When I was in UK quarantine, I received daily calls on my mobile and occasional SMS informative messages. I didn’t provide a landline.
No way are NHS tests acceptable PCR’s for inbound quarantine tests or outbound. In fact I was specifically asked by Test & Trace each day whether my booked tests were NHS or Private. I underwent 4 PCR tests within 11 days for a short UK visit, the last nasal swab made me bleed. I wonder how many have been injured by these tests?