The Insta360 X4 is compatible with many modern smartphones, but the device must fulfil certain minimum requirements.

- The Samsung Galaxy A55 must support OTG (On-The-Go).
- It should have a System on Chip (SOC) like Qualcomm 600 Series or 800 Series, or equivalent.
- Operating system should be Android 5.1 or higher.
- It should have at least 2 GB RAM.

Since the Samsung Galaxy A55 probably fulfils these requirements, it is probably compatible with the Insta360 X4. However, it is advisable to check the specific specifications of the Galaxy A55 and make sure that it fulfils the necessary requirements. If there are problems with the connection, the troubleshooting steps on the Insta360 website can be followed.