Global Taxi (White) was the first taxi company in Cambodia using taximeter. They usually offer an on-call 24/7 service, although sometimes they wait in tourist areas especially late at night. The price starts at 4000 Riel (1 USD) and will take you 2km then you have to pay 400 Riel per km.
The taxi costs from 5$-7$ from the 20-50 minutes or 20$-30$ per day ride into and within the city center. Cheaper, faster and less comfortable, motorcycle taxis can be hired for $2 in town. For transfer from hotel to airport costs from 8$-10$ per way and you can find it at most hotels and travel agencies near by you.
Reumork or Cyclo
At the moment, most tourists can find the easy way by taking the Reumork (Tri-cycle motor) or Cyclo (Tri-cycle) at any where in city with cheap price. Cyclo is charged in cheapest price and it is most used by many tourists who wanted to visit city slowly.
For taxi to province, you can find it around Phsar Thmei (New Central market) or Phsar Deum Ker or at any travel agents.