Yes, phone call services in 5G can operate without the internet, thanks to the inclusion of voice services in the 5G network infrastructure.

Voice Services in 5G:

1. Voice over New Radio (VoNR): 5G networks support VoNR, which is a new technology for delivering voice services directly over the 5G network, independent of internet-based systems. This allows for high-quality voice calls using the 5G infrastructure itself.
2. Fallback to 4G (VoLTE): In areas where 5G coverage is limited or VoNR is not yet deployed, 5G-enabled devices can fall back to 4G LTE networks to handle voice calls using Voice over LTE (VoLTE), which also does not rely on the internet for voice communication.
3. Circuit-Switched Voice: For traditional voice calls, 5G networks can use circuit-switched technologies, similar to those in previous generations, which do not require internet connectivity.

In summary, 5G can support voice calls through native 5G technologies like VoNR or by falling back to existing 4G networks, without needing an internet connection.