1. Introduction
Designed for vloggers, filmmakers, and content creators, the SMALLRIG Universal Smartphone Cage Kit 3155 enhances your mobile shooting capabilities by providing a stable platform and multiple mounting options for accessories. This kit is engineered to offer a more stable and professional shooting experience for various mobile devices, including a wide range of iPhones, Samsung Galaxy, Huawei, and Xiaomi models.
2. Product Components
The SMALLRIG Universal Smartphone Cage Kit 3155 includes the following components:
- 1 x Universal Smartphone Cage
- 2 x Side Handles
- 1 x Top Handle
- 2 x Allen Wrenches (one hidden in handle base)
- 2 x Cable Ties

Figure 2.1: This image displays the various components included in the SMALLRIG Universal Smartphone Cage Kit 3155, including the cage, side handles, top handle, Allen wrenches, and cable ties. Key dimensions and weight are also shown.
3. Setup and Assembly
3.1 Attaching Your Smartphone
- Locate the adjustable screw lock mechanism on the cage.
- Rotate the screw to widen the jaws of the cage.
- Carefully place your smartphone into the cage, ensuring it is centered.
- Tighten the screw until your smartphone is securely held in place. The cage supports phones with a width between 57mm and 90mm (2.24 to 3.54 inches). Do not overtighten.

Figure 3.1: This image illustrates the adjustable screw lock mechanism of the cage, demonstrating how to securely mount your smartphone. The cage is compatible with phones ranging from 57mm to 90mm in width.
3.2 Attaching Handles
- Side Handles: Attach the two side handles to the designated mounting points on either side of the cage. Use the provided Allen wrenches to tighten the screws for a stable connection.
- Top Handle: Secure the top handle to the cold shoe mount or 1/4-inch screw hole on the top of the cage. Tighten firmly.
Note: An Allen wrench is conveniently hidden and secured by a magnet in the base of the side handle for quick adjustments.

Figure 3.2: This image shows the fully assembled SMALLRIG Universal Smartphone Cage Kit with a smartphone mounted, demonstrating the placement of the side handles and top handle for stable operation.
4. Operating Instructions
4.1 Shooting Modes
The cage kit supports various shooting configurations:
- Handheld Shooting: Use the side handles for stable two-handed operation in both horizontal (landscape) and vertical (portrait) orientations. The top handle provides an additional grip for low-angle shots.
- Tripod Shooting: The cage features multiple 1/4-inch threaded holes on the bottom, allowing you to mount it onto a tripod or monopod for static shots or smooth panning.

Figure 4.1: This image demonstrates the versatility of the cage, showing its use for tripod shooting and handheld operation in both horizontal and vertical orientations, providing stable footage for various scenarios.
4.2 Attaching Accessories
The cage is equipped with multiple expansion ports for attaching external accessories:
- Cold Shoe Mounts: Two cold shoe mounts are located on the top of the cage, ideal for mounting microphones, LED lights, or other cold shoe compatible accessories.
- 1/4-inch Threaded Holes: Multiple 1/4-inch threaded holes are distributed around the cage, allowing for attachment of additional handles, magic arms, or other rigging components.

Figure 4.2: This image highlights the multiple expansion ports on the cage, including cold shoe mounts for microphones and LED lights, and 1/4-inch screw holes for attaching additional accessories like tripods.
5. Maintenance
To ensure the longevity and optimal performance of your SMALLRIG Universal Smartphone Cage Kit, follow these maintenance guidelines:
- Cleaning: Wipe the cage and handles with a soft, dry cloth after each use to remove dust and fingerprints. For stubborn dirt, a slightly damp cloth can be used, followed by immediate drying. Avoid abrasive cleaners or solvents.
- Storage: Store the kit in a cool, dry place away from direct sunlight and extreme temperatures. If disassembling, keep all components and Allen wrenches together to prevent loss.
- Regular Checks: Periodically check all screws and connections for tightness. Re-tighten as necessary using the provided Allen wrenches to maintain stability and prevent components from loosening during use.
6. Troubleshooting
6.1 Common Issues
- Loose Screws/Components: If you notice any parts becoming loose during use, immediately stop operation. Use the appropriate Allen wrench to re-tighten all screws securely. Regular checks before each use can prevent this issue.
- Smartphone Not Fitting Securely: Ensure your smartphone's width is within the compatible range of 57mm to 90mm (2.24 to 3.54 inches). Make sure the adjustable screw lock is fully tightened without excessive force. Remove any bulky phone cases if they prevent proper fit.
- Accessories Not Mounting: Verify that accessories are compatible with cold shoe mounts or 1/4-inch threaded holes. Ensure screws are aligned and tightened correctly.
7. Specifications
| Feature | Specification |
|---|---|
| Brand | SMALLRIG |
| Model | 3155-CF |
| Color | Black |
| Compatible Devices | For iPhone 15/15 Plus/15 Pro/15 Pro Max/14/14 Plus/14 Pro/14 Pro Max/13/13 Pro/13 Mini/13 Pro Max/12/12 Pro/12 Mini/12 Pro Max/11/11 Pro/11 Pro Max, for Xiaomi, etc. Cage supports phones 57mm~90mm (2.24~3.54 inches) wide (with case), for Huawei P60/60 Pro/60Pro Max/50/50 Pro/50 Pro Max/40/40 Pro/40 Pro Max, Mate Series, for Samsung Galaxy S23/S22/S21/S20 Ultra/Note20/10, Pixel 7/6/5 series |
| Product Dimensions (L x W x H) | 37.8 x 18.4 x 8.5 cm |
| Item Weight | 539 Grams |
| Maximum Weight Recommendation | 539 Grams |
| Style | Handheld Kit |
| Country of Origin | China |
8. Warranty and Support
8.1 Manufacturer Warranty
This product comes with a 2-year manufacturer's warranty. Please retain your proof of purchase for warranty claims.
8.2 Customer Support
For any questions regarding installation, operation, or troubleshooting that are not covered in this manual, please contact SMALLRIG customer support. Refer to the product packaging or the official SMALLRIG website for the most current contact information.