The ETravelSim Malaysia eSIM is for Malaysia only, so data stops the moment you cross into Singapore via the Causeway, Thailand via the northern border, Indonesia, or Vietnam. For multi-country Southeast Asia trips, ETravelSim sells an Asia 14 Countries eSIM covering wider regional travel on a single plan. If anything goes wrong with activation, contact support 24/7 via WhatsApp at +65 9236 1258, the on-site chat, or support@etravelsim.com with your order number.