In short: Holafly is a travel eSIM with unlimited data per destination, but no German number and no calls/SMS (calls only via apps like WhatsApp). Simsalasim is a full plan for €10 a month with unlimited data in 100 countries that you use at home and away.

FeatureSimsalasimHolafly
What you getfull plan: data, minutes, textsdata only (unlimited) for one trip
German numberyes, free to bringno
Minutes and textsunlimited (to 50 countries)no (apps only)
Travel dataunlimited in 100 countriesunlimited, per destination, time-limited
Price€10/monthGermany e.g. 7 days €25.50* / 30 days €70.90*

What speaks for Holafly: unlimited data for a single trip, with no plan switch.

What speaks for Simsalasim: one plan for everything, including a German number and calls, instead of buying again per trip, and usually much cheaper per month.

Verdict: For a single data trip, Holafly can fit. For frequent travelers and anyone who wants one plan at home and away, Simsalasim is the better option.

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