18/07/2024
Check your phone model, many 4G phones still fall back to 3G to make calls, and some only make emergency calls on 3G.
Optus and Telstra close access to 3G in September.
This may affect alert pendents (used by elderly incase of falls) home security systems and "home phones" that rely on the mobile phone network.
Ahead of 3G network closures.