Why is my data going so fast?

Most of it is your phone using data in the background: cloud photo backups, app updates, feeds refreshing. A laptop on your hotspot can quietly swallow gigabytes too.

First, type check data to Atli. The card shows what went and what is left, so you are not guessing.

Then cut the biggest users:

• iPhone: set the Atli eSIM to Low Data Mode (Settings › Cellular › SIMs › Atli › Data Mode), and turn off Back Up Over Cellular (Settings › Apple Account › iCloud › iCloud Backup)
• Android: turn on Data Saver (Settings › Connections, or Network & internet), and let photos back up on wifi only
• App updates: set the App Store or Play Store to update over wifi only
• Streaming: drop the quality a notch. High quality video can use 1 GB in about 20 minutes
• Hotspot: laptops use far more than phones, so keep an eye on the meter while sharing

The full walkthroughs live in iPhone setup and Android setup.