On mobile
On Android
You see an incoming GSM call during an ongoing Wire call. You can choose to answer or ignore the call. In case you answer the call, the Wire call will end.
On iOS
In case CallKit is enabled (in Wire settings: Options – Share with iOS – toggle on): An incoming GSM call will be indicated during an ongoing Wire call. You can choose to answer or ignore the call. In case you answer the call, the Wire call will end.
In case CallKit is disabled (in Wire settings: Options – Share with iOS – toggle off): An incoming GSM call always takes priority over a Wire call. Whether you answer or ignore an incoming call, the Wire call will end, and you need to call back.