[verticalscaler]

https://en.wikipedia.org/wiki/Mobile_virtual_network_operato...

You'd be cutting deals with the existing providers, one by one, and acting as a reseller.

A dated doc: https://www.gtigroup.org/d/file/Resources/rep/2016-12-16/2eb...

[toast0]

There'e also MVNO as a service providers. It's probably worth calling a few of them to see if that's a credible way to get started.