In short: Holafly is known for unlimited data per destination but is much pricier; Saily (by NordVPN) focuses on cheap data packs and security extras. Both are primarily data eSIMs, and neither offers a German number. Simsalasim gives you unlimited data in 100 countries plus a German number and calls for €10.

FeatureHolaflySailySimsalasim
Dataunlimited per destinationfixed packs + unlimited optionunlimited (100 countries)
Priceunlimited from about €3.79* per day; monthly plan from €59.90* (160+ countries)from about €3.49* (1 GB/7 days); unlimited from about €18.49* (7 days)€10/month
German numbernonoyes
Minutes and textsnot includedoptional via a US number: from €1.99*/month plus call and text packages from €0.99*, local calls only in the country you are inunlimited to 50 countries, included in the price
For home usenonoyes

Verdict: For a single trip with heavy data use, Holafly is appealing; for cheap trips, Saily. As a permanent plan with a number and unlimited data, Simsalasim is far cheaper: unlimited in 100 countries for €10 instead of from €59.90 a month.

Competitor prices as of October 2026; offers may change.

*Prices and offers can change over time (as of October 2026).