What does the providor has to do with that? There are special scissors that cut the normal sim into a micro sim. It's not that of a technological advancement.
Well that's what I said, the micro sim is only smaller in size than a regular sim and by cutting the regular sim in a certain manner you get a micro sim. If you don't want to do with a regular pair of scissors there are special scissors that do the trick.
You can't get the exact same clock app as you had on HTC Sense, but try searching "weather clock" or something on the market. And I guess you'll have to find a calendar app with a decent widget too. Can't really give you any examples because I don't use one myself.