Probably be cheaper to as you suggest, but I imagine it's still a pain in the groin having to manage two different SIMs.
A Brit that often finds themselves in both the UK and Europe would no longer have a seemless transition when going back and forth.
A vacationing Brit is only slightly inconvenienced by this, I suppose. Sure, they would have to do a little planning ahead if they want to be reached via a phone call.
I'm sorry, but you are barely scratching the surface and you are not looking at the big picture.
I have a business in three countries, yet I am based in the EU. The UK is one of my businesses so therefore I need a UK phone number, UK banks, but I am also British by birth and passport, and I own property there too. I've not lived in the UK now for 16 years and I have little intention of returning for the moment. (It's been just over 2 years since I set foot in the UK).
Are you beginning to see the problem?
It's not a slight inconvenience.
My business in the UK is being deliberately targeted by now uncontrolled telecoms operators and the regulations don't care one bit. They will however be pocketing quite a bit as a result.
To access my UK bank accounts, I need a UK mobile. I am now going to be cut off as the maximum roaming period from Three is 2 months. That expires on the 17th of September. How do I now access my money?
My UK number will be effectively suspended until I return to the UK so how will my clients call me?
Still not getting it?
The beauty of the EU is the fact that all the above was allowed and managed accordingly. I didn't need separate business papers to work in the UK (I do now), I didn't need to worry about roaming fees and I could have my UK mobile number indefinitely roaming (that's now all gone), and I had the freedom to live wherever the heck I wanted in the UK without any judgement, restrictions or anything else that would impede me and my work.
Again, all gone. Just shipping an item from the UK to clients has become a joke.
Brexit is BS and once again for the umpteenth time, it's affecting millions negatively. Just because you have an obtuse view of this due to the fact you've never lived abroad, or don't have multiple businesses in multiple countries or work across the EU and UK, you just simply don't see it.
I am at the point now that I am considering selling all my assets, and shutting down all my UK business operations and taking that elsewhere. It's a total betrayal of my country against me and many millions of Britons and frankly, as I mentioned earlier, I am (as are many other people like me), considering completely turning our backs to the UK following this disgrace.
But you have your little blue passport. I hope it was worth it.