One of the biggest mistakes travelers make is turning off their cell phone's wireless plan when they're abroad to save a buck, said Katie Crowe, a spokeswoman for travel Insurer battleface. "Making sure you're connected is critical for safety," she said. The workaround? A better connection. Battleface recently teamed up with eSIM company CELITECH to allow customers to buy and install an eSIM within their mobile devices through a QR code activation.