A college student sits alone in a dorm room, scrolling through a phone while a campus full of potential friendships hums just outside the door. For many students, that picture is ordinary. According to a new study, it may also carry a hidden psychological cost.
Mobile phone addiction affects roughly one in four Chinese college students. Researchers who surveyed more than 1,000 of them found that compulsive phone use doesn’t just correlate with depression and anxiety on its own — it appears to trigger a chain reaction that runs straight through the quality of students’ real-world friendships.
One in four students, one compulsive habit
Mobile phone addiction isn’t just heavy use — it’s uncontrolled, excessive use that impairs both physical and mental health. Among Chinese college students, studies put its prevalence somewhere between 21.4% and 27.4%, meaning roughly one in four meets the threshold.
The college years are a key window for psychosocial development. Students are building identities, forming lasting relationships, and learning to regulate emotions without the structure of home. Prior research ties phone addiction during this period to disrupted sleep, academic procrastination, and a growing sense of interpersonal alienation — a cluster of consequences that compounds quietly over time.
How the study was designed
Researchers surveyed 1,083 college students drawn from four universities in Shanghai and Shaanxi Province. The sample was 58.2% female, with a mean age of roughly 19.9 years. Participants completed validated scales measuring mobile phone addiction, friendship quality, preference for solitude, depression, and anxiety.
Of the 1,270 questionnaires collected, 187 were excluded for abnormal response times, stereotyped answer patterns, or failing an embedded attention check. The final valid response rate was 85.28%. Researchers then tested a moderated mediation model using SPSS PROCESS macro Model 8 with 5,000-repetition Bootstrap resampling.
Friendship as the missing link
The core correlations pointed in expected directions. Mobile phone addiction was significantly negatively correlated with friendship quality and positively correlated with both depression and anxiety. Higher friendship quality, in turn, correlated with lower scores on both outcomes.
Friendship quality acted as a partial mediator — phone addiction appears to reduce offline interaction, which erodes friendship quality, which then elevates depression and anxiety. High-quality friendships serve as a buffer by providing peer social support, a resource that compulsive phone use quietly depletes. Bootstrap confidence intervals for the mediation pathway excluded zero for both outcomes.
The solitude factor: an amplifier with an asymmetric effect
Students who scored higher on preference for solitude showed stronger associations between phone addiction and both reduced friendship quality and depressive symptoms. The effect wasn’t symmetrical, though. Preference for solitude moderated the direct path from phone addiction to depression — not to anxiety.
The indirect path running through friendship quality was amplified by solitude preference for both depression and anxiety. The direct anxiety pathway, however, remained unaffected. That asymmetry challenges a common assumption: that depression and anxiety, because they so often co-occur, respond identically to the same risk factors.
Why depression and anxiety diverge: two theoretical explanations
Researchers draw on two established frameworks to explain the split. Clark and Watson’s tripartite model distinguishes depression by low positive affect and anxiety by high physiological arousal. Phone addiction displaces activities that generate pleasure — face-to-face socializing being the obvious one. Students who already prefer solitude have fewer such sources of positive affect, so the depletion hits depression harder than anxiety.
Beck’s cognitive specificity theory offers a complementary lens. Depression centers on cognitions of loss, while anxiety centers on future threat. Students who prefer solitude are more prone to rumination and more likely to internalize loss-related thoughts into a broader denial of self-worth. Cultural context adds another layer: in China’s collectivist culture, solitude tends to be viewed as maladaptive, which may intensify its negative psychological effects considerably.
What universities can do — and what researchers still need to learn
The findings point toward practical directions. Campuses can help by promoting offline group activities, club events, and class gatherings that give students organic opportunities to build real-world friendships. Students with a strong preference for solitude represent a specific high-risk group for depression and may benefit from individualized mental health support.
The study’s limitations deserve acknowledgment. Its cross-sectional design captures associations, not causes. Longitudinal designs, stratified sampling, and objective phone-use metrics — actual screen time logs, app-usage data — would all strengthen the causal story considerably.
The image of a student alone with a phone isn’t inherently troubling. Solitude has real value, and technology connects as much as it isolates. But this research suggests that combining compulsive phone use with a deep preference for being alone may quietly close off the very friendships that protect against depression. The phone fills the silence without filling the need.
The full study is available here: Mi X and Li X (2026) The relationship between mobile phone addiction and depression, anxiety among Chinese college students: the mediating role of friendship quality and the moderating effect of preference for solitude. Front. Psychiatry 17:1859953. doi: 10.3389/fpsyt.2026.1859953