Not Checking Your Cell Phone Plan
I had already left the country a handful of times before I found out that my cell carrier actually offers a complimentary international plan; it just needed to be activated. Every time I struggled to connect to a WiFi source to navigate or check in with loved ones was totally preventable, and I had no idea. Check to see what kind of international plan your carrier provides — it could be totally free or come with a meager fee. Most importantly, you want to avoid being welcomed home with a four-digit cell phone bill.