"ARM makes the chips that power the majority of the world’s smartphones."
Qualcomm is the market leader for phone CPUs (so much so that the Chinese have initiated anti-trust action).
As I understand it, Qualcomm's 32-bit CPUs are an internal design implementing the ARM instruction set. It is known as "Krait." Qualcomm does not use ARM Cortex cores for most of their successful products.
Qualcomm's latest CPU is 64-bit, and this CPU did use an ARM design. It has been problematic as it generates too much heat.
ARM neither makes nor designs the most successful phone chips. ARM's contribution is the instruction set for the Krait segment of the market.