Left unchanged, those settings can cause your phone to slurp up all of your plan's allowed data even if you're swiping and tapping conservatively. Find the following settings and change them.

The key to avoiding international roaming charges? Control your use of apps or buy a prepaid SIM card.

How to Avoid Overpaying for Cellphone Data Use these expert tips to save money and dodge spending more than necessary on your phone bill.

How can I set up everyone's phones to stop eating data once they go over their allotment and "encourage" them to use Wi-Fi, including my phone? Sincerely, Data Director Dear Data Director, ...

You can turn off data on an iPhone all at once, for specific apps, or by turning on Airplane Mode through the Control Center. Here's how to do each.

To do that, open the Google Drive site and sign in to your account. In the site’s top-right corner, click the gear icon and ...

How-To How to avoid iPhone data roaming charges abroad Simple tips and cost-saving measures to save you from costly iPhone data roaming charges while on holiday outside the UK or EU.

Avoid charges by switching your phone to airplane mode – or turning off data roaming – and using the ship’s Wifi, although this may also come with a cost.

Even if they aren't actively using their phone, they can rack up hundreds, sometimes thousands of dollars in charges as data streams to their phone over foreign networks.