So I am located in Canada and have just bought 2 Series 4 with mobile.
In Canada, Rogers Fido and Bell only offer mobile Apple Watch service.
I've talked to Rogers and Bell so far, and they both want me to take my phones over from the fido with a higher monthly rate and then pay a surcharge to add the cell phone to my Apple watches
Questions – These companies offer standalone services to iPads with mobile service. Can I order a mobile sim for iPad with a data plan and just put it in the Apple Watch? I just want to be able to leave the phone at home and use iMessage and Apple Music when you're out for a race or bike ride