First, make sure your device isn’t running any data-hogging apps in the background. When bandwidth is precious, you don’t want to waste it on making updates, syncing data to the cloud, downloading new files, or loading GIFs on Twitter. Head to your system tray or menu bar and quit any data-munching apps you don’t need. While you’re there, make sure your apps aren’t auto-updating in the background. Save that process for more reliable Wi-Fi.