AmEx sometimes flags EU merchants for cardholders outside the EU. Call AmEx to whitelist Openline (Bulgaria) or use Apple Pay / PayPal instead — same underlying card, different transaction path.

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.