Only on 2G/3G networks. 4G+ is an IP network. Don't forget - SMS was a hack in the system messages: > The key idea for SMS was to use this telephone-optimized

Only on 2G/3G networks. 4G+ is an IP network. Don't forget - SMS was a hack in the system messages: > The key idea for SMS was to use this telephone-optimized system, and to transport messages on the signalling paths needed to control the telephone traffic during periods when no signalling traffic existed.