Preparing for your initial visit to Bangkok, Thailand? As a seasoned local guide familiar with this fantastic city - from the Grand Palace's golden spires to Yaowarat's vibrant street food stalls - the top question I receive from travelers is: "How do I get a SIM card or eSIM in Bangkok?" Whether your plans include sharing temple selfies on Instagram, navigating with Google Maps, booking a Grab, translating a Thai menu, or video-calling from Wat Pho - a trustworthy Bangkok SIM or eSIM is critically important. This guide covers all the essentials: the top carriers, how much data you truly require, where to purchase at Suvarnabhumi Airport, actual prices, and tips to avoid tourist SIM scams.