If the Argentina eSIM doesn't connect after installation, work through three quick fixes first: toggle Airplane Mode on and off, confirm Data Roaming is enabled in settings, and verify ETravelSim is selected as the default mobile data line. If it still doesn't connect, contact support via WhatsApp at +65 9236 1258, the on-site chat, or support@etravelsim.com with your order number — support is 24/7 and prioritizes order-number queries. For refund eligibility (especially on uninstalled eSIMs), reach out before scanning the QR code — installed eSIMs are harder to refund because activation is timestamped at the network.