Updated September 28, 2026
What is Seller type?
In short
Seller type says whether a provider runs its own network or resells another one, which decides whose coverage applies abroad.
Seller type tells you whether a provider runs its own network or resells someone else's, and that decides whose coverage applies when you cross a border. In this comparison every seller is listed as a carrier: 1&1 (1und1) is carrier and 4ka is carrier, so read the roaming terms of the network behind each brand.
Sources
- unternehmen.1und1.de, checked September 26, 2026
- 4ka.sk, checked September 26, 2026