iPhones share a single antenna between Bluetooth and 2.4 GHz Wi-Fi. When Bluetooth is active, it competes with the camera’s Wi-Fi signal and slows down data transfer.
Fixes
Set up the Bluetooth Extension to toggle Bluetooth automatically when you connect and disconnect.
Alternatively, Disable Bluetooth from iOS Settings (not Control Center). Control Center only disconnects active devices — it doesn’t turn off the Bluetooth radio.
Reduce preview quality to 2M in camera’s Remote Shoot Settings (Sony only). Smaller images transfer faster.
Move closer to the camera.
Avoid crowded Wi-Fi environments — areas with many 2.4 GHz networks cause more interference.
Bluetooth Extension Setup Video
5 GHz Cameras
If your Sony camera supports 5 GHz Wi-Fi, enable it in the menu. The 5 GHz band uses a separate antenna, so Bluetooth doesn’t interfere.