Some cellular companies allow you to get multiple SIMs, specifically for this purpose.
Maybe it isn't an option in your area, but a lot of people do have the option.
Maybe it isn't an option in your area, but a lot of people do have the option.
Because they're nice like that.
In most places that's not as balkanized as the US carrier market, you basically get multiple SIMs for your plan and that's it. Nobody gets to question what kind of device you put those SIMs into.
It is used mostly for tablets here(main simcard is in the phone) or a mifi for car.
I don't expect to use my iPad (or anything else) away from Wi-Fi all that much, so that may be part of the issue. If I thought I'd use it more $10 may seem more reasonable. Like if I traveled a lot.