I have Tmobile. Its weird. Whenever I speak to someone while connected to wifi calling, it kinda goes in and out, like static. This issue does not happen when off wifi calling. The weird thing is, if I call someone connected to my wifi network, there is ZERO issues. If someone else makes calls connected to my wifi, they have no issues ( they also dont have an iPhone X though ) Any ideas? Is this more of a Tmobile radio thing when using wifi calling? Probably a fix in the future?