To reduce data usage, make sure you turn off cellular data and set your phone to "airplane mode." You don't want your phone to grab data the minute you take it off airplane mode, even for a minute. Turn off or restrict background apps that refresh or update automatically, using data even when the app is closed.

To help keep your phone safe from pickpockets, carry it in your front pocket, not your back one – or even better, use something to attach it to you physically, like a lanyard or a crossbody phone strap.