How does OTP verification work with an international eSIM?

OTP (One-Time Password) messages are standard SMS sent to your phone number. To receive them abroad, you use a dual-SIM setup. Your data-only international eSIM provides the internet connection, while your primary SIM remains active (with data roaming off) specifically to catch these incoming texts. The OTP arrives via your home carrier's network, but you don't pay roaming fees for just receiving it.