SIM and eSIM choices for Chiang Mai are the first thing every smart traveller should sort before discovering this beautiful city. Whether you are wandering through the ancient moat-surrounded Old City, climbing Doi Inthanon - Thailand's highest peak - or visiting the 300+ temples that make Chiang Mai northern Thailand's cultural capital, staying connected isn't a luxury anymore. It is a downright essential. In this guide I share everything I have learned from years of showing visitors around Chiang Mai: what data amount you really require, which carrier covers the mountain villages as well as the old city lanes, the price of a SIM or eSIM, and the safest places to buy one - all so you can spend less time worrying about Wi-Fi and more time creating lasting memories with your family.