I Can only make wifi calls on my iPhone why?

If you can only make Wi-Fi calls on your iphone, it could be due to a weak cellular signal in your area, prompting your phone to rely on Wi-Fi for calls. Additionally, Wi-Fi Calling must be enabled in your phone's settings, and your carrier must support this feature. Make sure your iphone is updated to the latest iOS version, and check with your carrier for any restrictions or issues with your cellular service.