Environment:
GSM
4G
Onomondo app:
Network Logs
Question:
Why is my device connecting to 4G and GSM simultaneously?
Answer:
Simply put, your device is connecting to two different sides of the network.
GSM is the circuit-switched side, which most often handles voice calls and SMS.
4G is the packet-switched side, which is necessary for high-bandwidth data transfer.
GSM and 4G registration events do not mean simultaneous connections. It is a sequential process that ensures that basic connectivity is provided (through GSM).