Phone

In US, they are testing a system where airlines passenger will only have to show their mobile phone with downloaded 2D barcodes to check-in. That's cool.

In case your battery died, you can also print the codes from kiosk nearby provided you remember the reservation number. Cool

Phones are lifesavers these days. I am blogging via my phone now. All the post you see since Dec are via my mobile.

Yup, phones are very important indeed.