Swedish term (edited): tjänsteleverantör

In telecom, a distinction is often made between network operators and service providers, network operators being the ones who move bits around at the low level. As an example, a telco that owns their own mobile base stations, and/or international backbone, is a network operator.

On the other hand, companies who sell services are, well, service providers. (Even I am one, since I operate a premium rate number for my business.) A service provider always needs access to a network operator (or to an intermediate service provider) in order to deliver their service; one could say that network operators are higher up the food chain than service providers, who in turn are above their customers.

This may well be just nice-to-know stuff; you decide whether it fits your bill.