Yes, the Galaxy Watch Ultra is compatible with a Samsung A34 5G phone. Here are the key points to consider:

- The Galaxy Watch Ultra requires a phone with Android 10.0 or higher and at least 2 GB of RAM for optimal compatibility.
- The Samsung Galaxy A34 5G runs Android 13 or higher and generally has more than 2 GB of RAM, making it compatible with the Galaxy Watch Ultra.
- It's important to download and update the Galaxy Wearable app on your phone to ensure a stable connection and access to all available features.

This way, you should be able to connect and use your Galaxy Watch Ultra with your Samsung A34 5G without any major problems.