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I'm not sure that's true. If Company A builds out a bunch of infrastructure but it's mostly used by Company B's customers, then Company A isn't getting the earn

I'm not sure that's true. If Company A builds out a bunch of infrastructure but it's mostly used by Company B's customers, then Company A isn't getting the earnings it needs to pay back the infrastructure investment. Either Company B's customers need to send some revenue to Company A, or Company A is going to go out of business, possibly taking the infrastructure with it. Roaming fees, whether paid by the customers, the companies, or both, are necessary to support building and maintaining the infrastructure. Now, when Company A and Company B are actually two divisions of the same parent company (which is apparently often the case for Vodaphone) then you're right; the roaming fees are double-dipping.

Fuxy 13y ago
Company A is still able to adjust pricing on a global level (all customers) to compensate. If too many of Company B's customers go on Company A's network pricing will increase until they start choosing cheaper networks automatically balancing load and keeping prices at a similar point. Plus we're talking about roaming here it's not like a lot of people decide to go on vacation at the same time and stay there for years until the company collapses.