Hello does anyone know why wifi calling does not work with an upc sim?? i was able to switch on the function when i made a call but the sim always grumbles that i should connect to the wifi.... then i put in the sim from the business mobile phone (swisscom) and see that it works fine. hiilfe!!!

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Answer

It is usually up to the respective telecommunications provider. I recommend that you check this with your provider. In this case, it can't be the smartphone. I have linked something else for you, which may already help:
https://www.upc.ch/de/support/mobile/wifi-calling/

Your data. Your choice.

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Question about Nothing Phone (1) (8GB)

Hello does anyone know why wifi calling does not work with an upc sim?? i was able to switch on the function when i made a call but the sim always grumbles that i should connect to the wifi.... then i put in the sim from the business mobile phone (swisscom) and see that it works fine. hiilfe!!!