Couldn't have said it better - you are 100% correct.
And yes - regarding a UK phone number: you can buy a pre-paid SIM in literally every single supermarket or corner shop / convenience store in the country like you would buy a can of Coke or a pack of chewing gum, this is a non-isue.
And yes - regarding a UK phone number: you can buy a pre-paid SIM in literally every single supermarket or corner shop / convenience store in the country like you would buy a can of Coke or a pack of chewing gum, this is a non-isue.