Being able to point my phone at a sign written in a foreign language and having it translated into English instantly is not only a killer app for me, it blows m

Being able to point my phone at a sign written in a foreign language and having it translated into English instantly is not only a killer app for me, it blows my mind that we've gone from no cellphones 20 years ago to this. I can also point it at the sky and know which star I'm looking at, or at the cover a book, not the barcode, and have it tell me the lowest price nationally. It can tell me exactly where on Earth I am, for free. I have SL4A on my phone also, so not only can I call anyone anywhere on earth at any time, I can solve ridiculously complex problems in a few moments that would've taken people years to do by hand less than a century ago. It takes pictures of people, has a compass, an entire encyclopedia and set of maps without being connected to any cell or wifi network, and can tell me exchange rates, how far it is to the nearest Chinese restaurant and theater, and play complex, interactive, three dimensional games. I don't know what other people consider a killer app, but I just can't get over the fact that I'm living in the future right now. This is so crazy. I can't believe all this crap fits in my pocket. It feels like between this and a multitool, I can accomplish pretty much anything. The device itself is the killer app for me. I'm glad we as a species have made these ridiculous advances possible. 20 years ago, phones didn't have screens on them. If you had caller ID, you were pretty much on the cutting edge.