I would be at work on the day of the installation and I may not pick calls during the scheduled installation time. NOW has informed me the engineer will call me before coming on the day. What will happen if I cannot pick the engineer's call if he calls?
NB: Someone who is over 18 will be at my house that day.
If it's from a mobile that they call you from, you might be able to drop them a text or phone back. No idea if it comes through as withheld though. That said pretty sure all you need is someone in the house.
Have a nosy at this link. More importantly the section re 'Do I need to be home when my broadband goes live?'
If you need to call the broadband team, when you click 'Get in touch' you want to select the following;