If you want to call on a regular mode, you need to use the non-Blockchain mode.
I think so.
There will be a notification from the traditional mode. Therefore, you will never miss a phone call while you are on the blockchain mode.
Through BOB, can we able to mine the other coins by connecting the nodes? If so, then many people will start buying this new mobile because it is completely built by using the block chain technology.
I think that this is impossible. Function X works on its own blockchain. How can this apply to the extraction of other coins? I think nothing. In addition, it is better to focus on a specific coin - f(x), than to follow many. Is not it?