📅 Published: April 2026 ⏱ Reading time: 11 minutes 📊 Research-backed with 18 sources ✍️ Based in Port Vila, Vanuatu I've been running a dual SIM phone since 2009 — back when it meant carrying a chunky device with two physical card slots, manually swapping between a local number and a roaming SIM every time I crossed a border. In 2026, that workflow looks almost unrecognisable. Half the flagship phones sold today don't even have a second physical slot anymore. Instead, they carry something called an eSIM, and most people I speak to still aren't sure what it actually is or whether it changes anything for them. This post is the plain-language answer to that question — backed by market data, real travel cost comparisons, and voices from people using these setups in the field right now. No spec-sheet padding. Just what you actually need to know. 1.5B Global eSIM connections 2026 Juniper Research [ 1 ] 700+ Carri...