One of the Paramaribo centrals, 1688 from a local phone, running around the clock with its own Android and iOS app alongside the dispatch line. Seventeen years in business.
The cars run on a meter, which is worth knowing in a city where most fares are a negotiation. They are not company-owned: Hertog is a central that its drivers work through rather than a fleet operator, and every car carries a visible car number, which is how you identify the one that was sent to you and how you refer to it afterwards.
WhatsApp is on +597 873 8527, and has been since they started using it.