It is not so long ago, just 25 years, having a phone in pocket was like an imagine. But not now we combined the phones with cameras and internet. And we have started to pay with our phones... Too much to say but you explained very well dear @taskmaster4450
But i want to add that, with technological improvement the defination of money has changed. For payments we dont even need "the papers" maybe in future we wont need money for our payments.