Taking a taxi in Bangkok
Taximeters in Bangkok
Taxis in Bangkok are very numerous and very easy to recognize with their flashy colors. Air-conditioned and comfortable, taximeters are cheaper than tuk-tuks but also slower because they can not slide that easily in Bangkok traffic. When they are free, the small red light text 'wang' meaning available in Thai is on. You can flag them down. In theory, you have to climb in the cab and tell the driver your destination and you will pay the amount indicated by the meter when you arrive. But it's not always that simple. Often, you have to insist to make the driver start the meter, which is normally mandatory. And if you are not willing to accept the unmetered price which is generally more expensive, it is not uncommon that the taxi simply goes away. Thai authorities are trying to fight against that pneomenon but are not that efficient. 
It is also possible to hire a taxi for very long journey and there too, there is a rates grid that every taxi should have. In general, it is displayed on the passenger seat
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Applications to order a taxi or a VTC in Bangkok
Grab Taxi
GRAB has become the number 1 app to order a taxi or VTC with your smartphone in Bangkok. The app will find you an available taxi and you are sure he will not reject you. There is a 20 baht fees for immediate booking and a 45 baht fee for a advance booking. But I must say that every time I tried to use it in Bangkok the estimated waiting time was always high or never decreasing so I almost gave up everytime to wave a taxi or tuk-tuk on the street. BOT is another popular VTC app you can use in Bangkok.Website: www.grab.co For now you can order GRAB ride in Thailand in the following cities: Ayutthaya, Bangkok, Buriram, Chiang Mai, Chiang Rai, Hua Hin, Khon Kaen, Krabi, Nakhon Ratchasima (Korat), Nakhon Si Thammarat, Pattaya, Phuket, Songkhla & Hat Yai, Surat Thani & Koh Samui, Ubon Ratchathani, Udon Thani. BOLT only operates in Bangkok, Phuket et Chiang mai for now.
Bolt
Bolt is an equivalent of Grab. Arriving later on the market, the application is not yet available in as many cities but is available in Bangkok, Chiang Mai, Phuket and Pattaya.Uber
UBER stopped its activities in Thailand since 8th April 2018 after selling its service in South Asia to GRAB.Other public transport in Bangkok
Bangkok skytain
The Bangkok Skytrain is called BTS. The trains have air condition and let you go over the heavy road traffic in the capital but you can not go everywhere even if connected to the Chao Phraya Express baots, it can let you go to major temples in Bangkok.
Chao Phraya Express
The Chao Phraya Express boats run regularly on the river running through Bangkok. They go to all monuments and interesting places on the river shores including Wat Phra Kaew, Wat Pho and Wat Arun, the three must see temples in Bangkok. Fare is cheap.
Bangkok bus lines
Taking the bus to get around is clearly not the easiest mean of transportation to use for a foreign tourist in Bangkok neither the fastest one but it's the cheapest one. Bangkok bus network is wide and you can go almost anywhere but just need to be patient.
Transports Bangkok
Only Thai city for the moment to have a metro (there is metro project in Phuket), Bangkok is the city in Thailand that offers more choices of public or individual transport (metro, bus, boats, tuktuks...). No, there are not just tuk-tuks and pink taxis to get around Bangkok !
