I have tested the K&F CONCEPT Smartphone Video Rig, a cell phone grip stabilizer cage with 3 cold shoe mounts, for recording professional mobile phone videos and would like to share my experiences. Here are my impressions:

Robust construction:
The smartphone video rig from K&F CONCEPT is well-made and made of high-quality material. The robust construction ensures that my smartphone is securely held while recording.

Versatile mounting options:
With the 3 Cold Shoe Mounts, the rig offers numerous options for mounting accessories such as microphones, LED lights or external monitors. This flexibility is particularly useful for expanding film equipment.

Stabilization for professional recordings:
The mobile phone grip stabilizer cage helps to minimize shake and ensures stabilized recordings. This is particularly useful when walking or in dynamic shooting situations.

Ergonomic design:
The handle is comfortable to hold and allows you to use it comfortably while recording. The ergonomic design helps to minimize fatigue during longer shoots.

Universal compatibility:
The Video Rig is compatible with various smartphones, including iPhone, Samsung, and others. The adjustable holder allows you to use smartphones of various sizes.

Conclusion:
The K&F CONCEPT Smartphone Video Rig offers a robust construction, versatile mounting options and stabilization for professional mobile phone videos. With this rig, I can expand my movie equipment and make high-quality recordings with my smartphone. I'm happy with this product and would recommend it to other videographers.