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The problem could be due to the Wileyfox swift 2 not supporting VOLTE which is required for making and receiving calls using 4G. If this is the cause of the problem you could go into the connection settings and set the phone to use 3G.
The 3G coverage available to phone will be limited due to the phone only supporting 3G 2100 MHz band. Most of Telstra’s towers transmit 3G on the 850 MHz band