Google enforcing two factor Authentication

[king1]

2FA can have it's dangers:

https://thenextweb.com/news/hackers-crac...yndication

I"m currently querying my phone provider with regard to 'sim swapping' and what protocols they have to assist in preventing this happening.  I did at one time buy a new sim card, (was having problems and thought the old one might be the cause), and then communicated with the provider and got my old number ported onto the new card.  I don't recall the security process involved but obviously for the 'Bad Guys' if they have the right info they can take over your phone - then you're in the Poo in regard to banking apps on the phone in particular.  So I'm asking my provider to give me any detail on how/what procedures or process they have in place to prevent this.

that's an interesting point, but they would need physical access to the the sim card wouldn't they?  
you do have to give a number on the sim card for it to be ported...

But your point is valid, what if i borrowed your phone for five minutes, whipped out the sim, took a quick photo of the number...
I could potentially then ring up pretend to be you and transfer the number to a blank sim...

I think this would be more likely with prepaid phones, surely they would confirm you are the account owner if it was an on account phone