I've been using Samsung for a couple of years now but I noticed last year that Samsung only allows phone calls to be routed on tablets if it's on the same WiFi network as the phone is. I used to have a Galaxy Note8 and when I was using the feature I could be on cellular data while my tablets on the same WiFi network can make calls using the CMC function. I'm not sure why Samsung made the change and it doesn't make sense to be honest; sometimes my phone can't use WiFi while my tablets can and yet I'm not able to make phone calls when my phone is on cellular data. You're able to do that with Apple phones though; I get it they're a FAANG company (big five tech giants in the US), why can't Samsung do the same?