We are being told deflation is bad for our economies and this is used as excuse from our central banks to print more money and destroy our savings/currencies.
That's not quite how it works. Whether quantitative easing is effective is a different story.
What they say is that in a deflationary environment, the price of goods falls so people would not buy anything and would rather wait to buy in future, therefore slowing the economy. If so why smartphones sell like hot cakes?
Despite what some anarcho-capitalists would like you to believe, a slight rate of deflation is not going to grind the economy to a halt. But in the long-term, it will have large negative economic effects.
their price is falling and people are buying them actually because of that. Maybe because each time the price decreases customers feel like they are getting a good deal, therefore are prompted to buy!!
Fail in economics. Deflation doesn't even mean smartphones have decreased in price, necessarily.
If our economies are not growing it means that there isn't much inflation pressure, so I don't see any reason to artificially induce inflation by destroying our currencies.
There are multiple reasons to induce a small rate of inflation. A small rate of inflation boosts economic growth significantly by encouraging consumption and investment, two major parts of Aggregate Demand in the economy.
In short, your post really disregards most economic theories.