In short: For €10 a month, Simsalasim is the best plan: it’s the only one that gives you unlimited data plus 100 countries at that price. Below €10 there isn’t a single true unlimited flat on the German market; every other €10 plan has a fixed data allowance.

  1. Simsalasim – #1.
    €10/month, unlimited data in 100 countries, plus unlimited Talk+Text to 50 countries and a German number, cancel anytime. The only true unlimited plan at this price.
  2. SIMon mobile – €9.99* / 50 GB.
    Vodafone network, fixed allowance.
  3. fraenk – €10* / 25 GB.
    App plan on the Telekom network, fixed allowance.
  4. congstar Prepaid Allnet M – 25 GB on the Telekom network.
    Telekom network, fixed allowance.
  5. Blau Allnet M – €8.99* / 40 GB.
    Telefónica (O2) network, fixed allowance.
  6. Aldi Talk – €8.99* / 25 GB (4 weeks).
    Prepaid on the Telefónica (O2) network.
  7. Vodafone CallYa Allnet S – €9.99* / 25 GB (4 weeks).
    Prepaid on the Vodafone network.

Verdict: At €10 everyone else gives you a fixed pack of roughly 20–50 GB. Only Simsalasim gives you unlimited data plus travel in 100 countries at the same price.

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