How to do FaceTime call on your own device?

I have an iPhone and an iPad. I carry my iPhone along with me while I'm out and iPad is at home most of the time. I tried doing a FaceTime call on my iPad while I was out. But I couldn't make it as both the devices are signed in using same Apple iCloud ID. Is there any other option?

I suggest registering FaceTime on iPhone with a number and on iPad with your apple ID

I don't think there's any other way. Possibly there could be!