Want to know the number one rule for taking a taxi in Hanoi? Make sure your driver starts the meter, unless you prefer to negotiate a flat fee. Have small-denomination dong on hand as capital city taxi drivers may not be able to easily break large bills.
Reliable taxi companies in Hanoi include Mai Linh (04 3822 2666) and Taxi CP (04 3826 2626) part of the larger and trustworthy Taxi Group.
Don't assume that your driver knows where your Hanoi destination is located. Taxi pilots in the capital city typically nab fares from all over town but that doesn't mean they are GPS experts. It pays jackpots to write down your destination or at the very least carry a small map or a smart phone with satnav capability. It's advisable to use a taxi from a well-established company and to keep your eye on the meter to avoid a potential rip-off.