We have free Wi-Fi for all our guests at Lipe Beach Resort. That said, Wi-Fi on Koh Lipe is generally slow as there is no fiber or even a decent internet cable. It is all beamed to Koh Lipe from a grumpy old tower on the mainland. If fast internet is really important for you we suggest you get a 2nd SIM or a Wi-Fi dongle and a DTAC tourist SIM. They have really good 3G and 4G speeds and you get 12GB of data for about 20 USD.