[pndy]

So let's say that in the future you got this alternative method deployed but then, what happens with already acquired phone numbers? Will you remove it once this method will be running nicely? Or you'll keep phone numbers giving a promise you won't use it to anything naughty and users will have choice to either keep it for "security purposes", or they will have ability to remove it by themselves directly from the client or by going the longer way, asking support to remove it from account data? Can you tell which solutions were considered so far?

Also, not sure if you're aware there but in some countries it's no longer possible to use SIM card without registering it first under name and last name and that means, the state has a possibility to track your online presence.