Apple Watch SE/series 6 Cellular + WiFi without cell phone operator supporting Apple Watch

Hi!

I have a particular cell phone operator ("Dipper" for small businesses, owned by the Norwegian Company "Telenor") with regards to work, and I cannot change the operator as for now.

I have asked them whether they support the usage of Apple Watch, and their reply is that Apple is the one approving which cell phone companies the Apple Watch is compatible with.

Telenor owns Dipper, and Telenor is the only phone company in Norway that has been approved by Apple. Is it not possible to approve more companies, Apple?

So to my question: Is it safe to purchase Apple Watch SE and still use the cellular features on the watch if my iPhone is in the same room? If this works, how close do I need to keep the iPhone in order to receive/answer calls on the watch?

Massive thanks in advance!

All the best,

MrNord