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These are retail prices. The wholesale ... are lower.

• gst 11y ago
  My example was about retail prices: You're correct that due to clearinghouse there are hardly any charges exchanged - as in most cases the outgoing roaming volume of a provider is comparable to the incoming roaming volume. But if you have two countries where retail prices differ a lot, this can lead to people from both countries to buy SIM cards from the cheaper country, causing an asymmetry in the roaming volume: Now suddenly one provider has lots of outgoing roaming, but much less incoming roaming - which means that this provider is going to have to pay the wholesale prices for the difference in roaming volume.