Sony HDR-AS300R Help Manual page 110

Select the SSID that is printed on a sticker attached to the rear of the camera's battery cover.
10
Return to the Home screen, then start PlayMemories Mobile.
11
Note
When Airplane mode is set to ON, the Wi-Fi function is not available.
Depending on local electrical interference or the smartphone's capabilities, the live view images may not be displayed smoothly.
When operating multiple cameras with a connected device, you cannot set the Wi-Fi on a smartphone via QR Code.
Related Topic
Airplane mode
Preparation for connecting to your smartphone