CSFB (Circuit Switched Fallback): A technique that allows a device to fall back to a 2G or 3G network when a 4G or 5G network is unavailable in order to make and receive voice calls.
CSFB (Circuit Switched Fallback): A technique that allows a device to fall back to a 2G or 3G network when a 4G or 5G network is unavailable in order to make and receive voice calls.