As an aside, as a single person I feel the discounts that come with family plans to be weirdly discriminatory. I go with prepaid TMobile (10gb for $40) because it’s much cheaper than a regular(?) plan with only 1 line. But to hook my Apple Watch up to cellular, I need the regular plan ($75 for one line + $10 for Apple Watch) as prepaid tech is years behind and second tier (most MVNOs included). That means that the only way I can use an Apple Watch on cellular as a single person is by paying $45 more per month. Complaining about an Apple Watch is a first world problem, but I think the pricing system is unfair.

I really wonder whether young members of the family consume more or less data, or what other reason could be used to justify family-discounting.. but it’s probably like a parent comment said: there’s no correlation between costs to the carrier and price the consumer pays; the single/family split exists to create the maximum profit off both groups by penalizing single people and convincing families to add all younger members to the plan (even those that might not need it). IMO carriers should give an age discount for under 18, not a per-line reduction the more members are in your plan.

They say "Family" but that's for marketing. If you have friends you trust to pay you, they don't actually check social security numbers or anything.

Cricket wants as many subscribers as possible, so they give discounts to groups of four.

I've had every single Apple Watch since the original one and never had the need to get cellular for it. What's the use case for when you got a watch on you but no phone near it (but still NEED to be reachable somehow)?

Running. Phones are massive these days and impractical to take running. Still need to be reachable for any number of reasons (or call if there's an emergency).

People who want to run without water or any kind of fanny pack. I bought an Apple Watch and got a cellular plan for it and quickly realized there was absolutely no reason I really needed it.

(It's also true that I long predate cell phones--and also am often in places that don't have cell phone coverage--so I really don't have the mindset that I always have to be reachable right now.)