18. Wear a watch
Phones are great, except when you’re traveling and they’re confused as to where you are, or which time zone, etc. Or when they are low on battery life and all the electric outlets are taken. Or when you’re in the airport, for your layover, and you have no idea where they put the clock, you don’t have a SIM card for Taiwan, because you’re just traveling through to Ho Chi Minh City.
Sometimes, you want to make sure your phone is charged enough so when you do get in country, you an easily navigate so you can get to your hostel.
What’s better is to bring a watch that you can easily set for whatever the local time is, both while dealing with layovers on the way there and back as well as moving between countries.
This also means you don’t have to deal with either bringing your phone everywhere or making sure it’s always fully charged.
So, just bring a watch.