On iPhone
Open Settings → Cellular or Mobile Data to review app usage. Check what period the statistics cover before dividing; it may not match a billing month.
Your trip.
Your data estimate.
Start with how you use your phone, then check a package’s allowance and validity separately.
A personal estimate
Plan around your usage.
Enter your own daily mobile-data estimate. This tool does not read your phone, track you or predict consumption.
How to find your usageAdd your daily estimate to calculate a total. The suggested extra allowance is editable.
Start with your phone.
Not a universal “GB per trip”.
Choose a recent period that resembles how you expect to travel. Divide its mobile-data total by the number of days. Adjust for anything different on this trip: downloads, video, navigation, cloud backups or work calls. Wi-Fi usage is separate.
On Google Pixel
Open Settings → Network & internet → SIMs → App data usage. Select a period and review the apps using mobile data. Menus on other Android phones can differ.
Check the provider’s meter
Your phone’s count and the provider’s count may differ. Use the package’s own remaining-data information when deciding whether you need more data.
Fixed data and daily data
answer different questions.
| Package type | What to compare | Do not assume |
|---|---|---|
| 5 GB total | A shared 5 GB allowance within the stated validity. | That the allowance resets daily. |
| 1 GB high-speed/day | Each day’s high-speed allowance, exact duration and fair-use terms. | That unused daily data rolls over, or that the reset follows your phone’s time zone. |
| Unlimited with fair use | The high-speed quota and what happens after it is reached. | Unlimited high-speed data or a guaranteed post-limit speed. |
A total-data estimate can help compare fixed plans. For a daily plan, check your busiest day too. We do not combine the two into a misleading single price-per-GB ranking.
Find your destination’s actual optionsCompare your estimate with a real destination.
Use your own data estimate, then check both the allowance and package validity. These links open the destination’s calculator and plan comparison.
A week in Japan
Allow for navigation, station searches and uploads. Enter your daily estimate, then compare fixed and daily packages.
A longer USA trip
Count the full stay. An allowance that meets your total-data estimate must also last through the days you need it.
City and beach days in Mexico
Compare quieter Wi-Fi days with days away from your accommodation. Review the busiest day as well as the total.