I've got a tablet (Android not iPad though) and it doesn't have a phone number. It doesn't even have the hardware to access the cell network.
As for phone numbers, I used to think I had only one, and it's shared with another person so I really only have half a phone number. But recently I found out accidentally that my Internet service is serviced via a phone number which I knew nothing about. And since said Internet service is also shared with that other person, that means I have one phone number.
I personally have just 1, but I have a phone at work too--so 2.
This is a little misleading because I have a cell, and no home phone. My wife has her own cell, and each of my kids had a cell before they moved out. So at our peak we had 5 cell phone a home phone and a work phone--for 7 phones for people in our family. Now we are down to my wife and myself, we do not have a home phone, but we each have a cell. Before cells we'd share a home phone, so we have twice as many phones as we would have had 20+ years ago.
We have DSL and our provider has assigned us an account number--we don't have a phone, but the account number is just a phone number that is not activated. So we have 3 "phone numbers" associated directly with us and 1 at my work for a total of 4.
Out on HF and heard nobody, but didn't call CQ? Nobody heard you either. 73 de N7GH
I have two: a mobile number and a landline number at home. I use my landline phone almost never, and almost nobody calls me on that phone.
I don't have any non-phone devices that have a SIM card with their own telephone number.
I don't have a work phone, or actually my mobile is officially my work phone (I work as a freelancer). The client at which I'm currently working does not have fixed phones at all on the desks in any of their offices. They do everything by mobile phone.
I have a landline, a prepaid phone, a smart phone from work, and an extra chip from a prepaid phone which I put in my prepaid phone (to switch with the normal number) to let people call I normally do not want to be called by. Like e.g. recruiters that want to talk to me.