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How eSIM works, activation, troubleshooting, data sizing and using it with your main SIM. 5 articles.
How much data do you need for travel? See GB estimates for 3, 7 and 14-day trips, a worked Japan example, when to go unlimited and how to save data.
19 October 2026
Travel eSIM showing No Service or SOS after landing? Follow this 5-minute checklist: data line, roaming, manual network and APN, before deleting anything.
18 October 2026
What do Primary and Travel mean on iPhone? Keep your home number for calls and OTP, set the travel eSIM as the data line, and avoid surprise roaming bills.
28 September 2026
Learn when to install a travel eSIM, how activation differs from connection, and which phone, carrier-lock and plan checks to make before you fly.
8 July 2026
Learn what eSIM is, how it works, and why it's the future of SIM cards. Discover eSIM benefits for travel, security, and everyday use with Corelinx.
29 May 2026
