u/Deadshot2210

I have had an iPhone 13 for like 3 years now, it's HK version (china version) but i don't live there. for some reason, this version doesn't have Facetime Audio, only Facetime Video. I know i can use Video and turn off the camera, but I miss the missed calls coming on audio. Does anyone know a work around to get it working on my iPhone? (P.S. it works only on my iPad ).