Lol...this has been such a **bleep** show. First it's strong arming you to switch. Then, oh no it's ok. You can stay and only switch if you want too. But we don't know when this will end. Then, oh we're gonna let people have an extra gig. Then, o...
The only carrier I've heard with this capability is T-Mobile in the US. They use something called digits where you can login to your number using another phone. But the idea is interesting especially for business purposes.
I have scored some pretty awesome deals with open box items at Best buy, clearance at Staples, and Amazon warehouse deals. Just to help those looking for unlocked phones.