This is almost always a deliberate app setting, not a camera fault.

Many 4G trail camera apps transmit compressed preview thumbnails (often 640×480 or lower) for fast delivery and reduced data consumption. The full-resolution image is stored on the SD card.

Check your app's transmission resolution settings. Most have options like "thumbnail only," "standard," or "full resolution." Switching to full resolution increases transmission time and data usage but delivers the actual captured image.

If the high-resolution setting is active and images are still blurry, the issue may be motion blur from the subject moving during exposure — common with animals in fast motion at night under IR illumination. A camera with a shorter exposure time or higher-speed IR LEDs will reduce motion blur.