Travel · official-source review · reviewed 2026-10-10
Roaming data charges arrive on the bill after the trip, when the phone has already been used every day.
Turn the days abroad and the data you expect each day into a total in gigabytes and an estimated cost at your carrier's rate.
Travelers planning to use a phone abroad who want to compare roaming with a local option before they leave.
Use the source document or official route that applies to your situation. This guide does not contact another person or verify external information.
Ask your carrier for the roaming rate per gigabyte or the day-pass price for your destination.
Check last month's data use and estimate the daily amount for the trip in megabytes.
Count the days you expect to use data abroad, including travel days.
The App converts megabytes to gigabytes with 1,024 megabytes per gigabyte and multiplies by the rate.
Compare the total with a local SIM or eSIM price before you choose roaming.
Seven days at 300 MB a day is about 2.05 GB. At $10 per GB, the estimate is $20.51.
Use your own source and details. The example is not a record about a real person or organization.
U.S. Federal Communications Commission · reviewed 2026-10-10
What this source supports: International roaming rates and day passes vary by carrier; travelers should compare roaming prices to local SIM or eSIM options before leaving.
Source limit: Prices and coverage change constantly; check your carrier and destination options before departure.
These sources support the statements above. They do not show that every person needs this guide. They do not show a specific result.
This guide estimates data from your own daily use and your carrier's price. It does not show coverage, check plans, or replace a carrier quote.
Prices and coverage change constantly; check your carrier and destination options before departure.
Use current instructions from the responsible organization. This guide is a planning aid, not an official decision or a substitute for qualified advice.
Turn the days abroad and the data you expect each day into a total in gigabytes and an estimated cost at your carrier's rate.
This App estimates data and cost from the numbers you enter. It does not show coverage, compare plans, or replace a carrier quote.
You enter every number yourself. The sources support the method and the limits. They do not produce a result for your specific case. Keep the original documents next to the sheet you build.
The App computes the worked example with your own numbers, in your browser.
APP 1
Turn the days abroad and the data you expect each day into a total in gigabytes and an estimated cost at your carrier's rate.
Free · no account · no upload
Open Roaming Data Cost EstimateThe App runs in this browser. It does not send or save entries. Copy, download, or print only when you choose.
This guide uses short, direct instructions as an ASD-STE100-style writing target. It is not a formal certification.
Companion App: Roaming Data Cost Estimate. It runs in this browser and does not upload your entries.
This guide is edited for clarity and checked against the sources it links. It is not a substitute for official instructions or qualified advice. A linked source does not show that every person needs this guide.