Mobile phones are not inherently smarter than computers; while modern smartphones have advanced computing power, traditional computers generally remain more capable for complex tasks.
Mobile phones are smarter then computers.

Practice Innovations: Are smartphones too powerful? - Thomson Reuters Institute
Source: thomsonreuters.com
Key Evidence
"Many tasks that used to be accomplished by using a desktop or laptop computer are now possible to do on smartphones," but computers still hold advantages in capability.
courses.lumenlearning.comcourses.lumenlearning.comDiscussion: Computers vs. Smartphones
"Computers are better than phones because in computer you can do anything that you want; in phone you do only limited stuff".
quora.comquora.comWhy are computers better than phones?
Smartphones are described as "ultimate personal computers" due to their smart capabilities but not necessarily superior overall computing power.
lifewire.comlifewire.comWhy Today's Smartphones Are the Ultimate Personal Computers
What the Evidence Shows
The claim that "Mobile phones are smarter than computers" is misleading because it oversimplifies the differences between these two types of devices. Smartphones today possess significant computing power, often comparable to or exceeding that of basic laptops or older workstations. They integrate advanced processors, AI capabilities, and connectivity features that enable many tasks once exclusive to computers. However, traditional computers, especially desktops and high-end laptops, still outperform smartphones in raw processing power, multitasking ability, software compatibility, and specialized applications.
Smartphones have evolved into powerful personal computing devices with capabilities such as AI processing, high-resolution displays, and extensive app ecosystems.lifewire.comlifewire.comWhy Today's Smartphones Are the Ultimate Personal Computers
Despite this, computers offer greater flexibility, larger storage, superior input/output options, and the ability to run complex software for professional and creative work.edutechdebate.orgedutechdebate.orgComputers Are Better than Mobile Phones, For Now « Educational Technology Debate
quora.comquora.comWhy are computers better than phones?
The distinction lies in use cases: smartphones excel in portability and communication, while computers excel in performance-intensive tasks.
Therefore, saying mobile phones are "smarter" than computers ignores the nuanced differences in design purpose and capability.