Settings → Network & internet → SIMs → tap the line you want → toggle "Use SIM" or "Mobile data" on/off. On Samsung: Settings → Connections → SIM Manager.

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.