The OpenSim journal

eSIM Research

Original studies with downloadable data about travel connectivity, roaming costs and eSIM pricing.

Germany, Austria and Portugal publish all six traveler-facing emergency alert facts in the ten-destination sample

Europe Emergency Alert Index: Will Tourists Get Phone Warnings in 10 Destinations?

Will a foreign phone get emergency alerts in Europe? We checked 10 popular destinations for tourist coverage, apps, data, language and device rules.

19 Sept 2026Read story

The latest

Only one of ten checked US carrier documentation sets directly answers whether a missed call reaching voicemail can create a roaming charge

eSIM Research

Does Checking Voicemail Abroad Cost Money? 10 US Carriers Compared

19 Sept 2026

Only one of ten checked guides publishes all eight emergency-call safety disclosures

eSIM Research

Travel eSIM Emergency Call Index: What 10 Online Guides Tell You About 911 and 112

8 Sept 2026

More esim research

Four of ten European rail ticket services publish a scoped offline-access statement, while nine publish a PDF, email or print route

eSIM Research

European Rail Ticket Offline Index: Can 10 Apps Show Tickets Without Data?

We checked 10 European rail apps for documented offline ticket access, refresh rules, PDF and wallet backups, screenshot limits and live-data needs.

5 Sept 2026

Only one of ten European ferry operators publishes all eight Wi-Fi planning facts, while nine publish a free condition and eight publish a paid price

eSIM Research

European Ferry Wi-Fi Price Index: Is Wi-Fi Free on 10 Operators?

We checked 10 European ferry operators for free Wi-Fi, paid prices, time and device limits, streaming rules and maritime mobile warnings. Explore the CSV.

4 Sept 2026

eSIM Research

Dual eSIM Capacity Index: Which Phones Can Run Two eSIMs at Once?

We compared 10 phone configurations to separate stored eSIM profiles, active eSIM limits, physical-SIM options and regional conditions. Explore the CSV.

3 Sept 2026

Three of ten sampled U.S. carriers publish all six roaming bill-shock safeguards

eSIM Research

Roaming Bill-Shock Safeguard Index: How 10 U.S. Carriers Warn or Stop Charges

We audited 10 U.S. carriers for arrival notices, roaming alerts, numeric limits, automatic blocks, traveler controls and usage tracking. Explore the CSV.

2 Sept 2026

Ten carrier roaming programs use three different models to start a charged day

eSIM Research

International Roaming Day-Pass Trigger Index: What Starts a Daily Charge at 10 Carriers

We checked 10 carrier roaming programs to see whether data, background activity, calls or texts start a daily fee and when each charged day ends.

1 Sept 2026

Only one of ten checked regional Europe eSIM plans names all ten selected non-EU stops: Ubigi Europe Extended scores 10 of 10 and Airalo Eurolink scores 9 of 10

eSIM Research

Europe eSIM Border-Gap Index: Which Plans Cover 10 Non-EU Stops?

Only 1 of 10 Europe plans covered all selected non-EU stops. Compare Kosovo, Balkans, Switzerland, Turkey and UK coverage in the source-linked data.

1 Sept 2026