The phrase "a provider which" is correct and usable in written English.
It can be used when referring to a specific provider or service that is being described or defined in more detail.
Example: "We are looking for a provider which offers reliable internet services at competitive prices."
Alternatives: "a provider that" or "a service provider which".
A provider which met all four of those conditions could be rewarded by being able to offer "additional or designated services" for additional fees (presumably), as well as "traffic prioritisation," which is what the original NYT story maintained.
You may choose to look for a provider which has declared 'Safe Harbor' status, a self-certification against a set of data protection principles between the US and the European Commission (and therefore only applying to companies based in the US).
But we encouraged submitters to use e-mail addresses that they thought they'd keep for a while, and from a provider which isn't likely to disappear, such as Yahoo!, Microsoft or Google.
Choose a provider which guarantees your video won't be removed or your account won't be banned.
A SaaS provider may rent a development environment from a PaaS provider, which might also rent an infrastructure from an IaaS provider.
Furthermore, our proposal also reduces the participation of a third party such as a broker or a payment provider, which makes it better for making micropayments for access to real-time services.
In this context the user is generally a SaaS provider, which wants to maximize her revenues providing a service that meets a certain QoS.
It keeps the federal government in a regulatory role, not a service provider, which is perfect.
Rather than a spectacular collapse of a large provider (which may still occur), it now seems that steady attrition of provision is becoming more likely.
Content companies frequently pay a middleman to carry traffic to a broadband provider, which then moves through its pipes and into a consumer's home.
In contrast, in conventional cellular communications a mobile network operator and/or a service provider which supports geomessaging capabilities are needed [17].
