SIM and eSIM choices for Chiang Mai are the first thing every smart traveller should sort before discovering this incredible city. If you are wandering through the ancient moat-encircled Old City, trekking to Doi Inthanon - the highest mountain in Thailand - or hopping between the more than 300 temples that make Chiang Mai the cultural heart of the North, staying connected has stopped being a luxury. It is a downright essential. In this guide you'll find everything I have learned from years of showing visitors around Chiang Mai: the ideal data plan for you, what network works in the mountain villages as well as the old city lanes, what you'll pay for a SIM or eSIM, and the most reliable vendors - all so you can spend less time fretting over Wi-Fi and more time making unforgettable memories with your family.