Japan's carriers have phased out most 3G. Modern iPhones and Android flagships handle VoLTE natively over Openline data. If your device is more than 5 years old, some voice apps may not work reliably; use WhatsApp or LINE data-based calls instead.

Still stuck?

Reach Openline support 24/7 through any of these channels:

When you write in, include your purchase code (the OL-… code we emailed you) and, if the eSIM is already installed, its ICCID (Settings → Cellular → tap the Openline line). That's enough for us to find your plan and diagnose without back-and-forth.