system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why phones have the 1 in the top row and descending from there, but calculators have the 1 at the bottom and ascend?

It’s never made sense to me and seems unnecessarily confusing for two very common uses of buttons with digits on them.
gpt
The layout of the two devices are unrelated. Phones arrived after the calculator style keyboard.

Early cash registers and adding machines used different layouts until the standardized around the layout you are familiar with.

The lower numbers particular the zero being at the base probably made sense for prices at the time. Some even had double zero key.

The phone layout did not start out as you see it know, it was originally a round shaped ring with the highest numbers furthest away with zero being after the nine. Early phone numbers had less digits and used the lowest numbers to reduce the effort and time for dialing.

The two layout are separated by a significant amount of time. The touch time phone was introduced around 1941. Adding machines were introduced in the late 1880s.

To summarize they are different because they have different origins and purposes. Having a person who has access to both is a modern development only happening within the last 50 years when pocket calculator became commonplace.