Modern WWAN might be a bit of a nightmare. I'm not super familiar with recent efforts in the space, but if Apple wanted to knock this out of the park, they'd need two things:

- Unlimited data plans, preferably at a non-insane price (sub $50-month would be nice)

- Both 4G LTE and 5G connectivity. Not just one or the other.

Both of these seem technically possible, but I'd assume they'd be incredibly difficult to pull-off from a business negotiation perspective.