Is my child addicted to their phone? Signs, evidence and what to do

The question lands in the Knock inbox most weeks. Is my child addicted to their phone? Honest answer: rarely yes in the clinical sense, rarely no in the lived sense. The published clinical picture and the lived parent experience don’t quite line up. That’s where this note starts.

What “phone addiction” means in the published clinical literature

In 2026, the formal diagnostic frameworks (DSM-5-TR, ICD-11) still don’t list “smartphone addiction” or “phone addiction” as a standalone disorder. They do recognise internet gaming disorder. The 2024 Lancet Psychiatry review treats problematic social-media use as a related signal, with measurable correlations to anxiety, depression and sleep problems in adolescents, particularly girls aged 11 to 14.

Clinical line: probably not “addicted” in a diagnostic sense. Behaviour line: probably yes, in the sense that the device has captured more of your child’s attention than you, your child or your family is comfortable with.

Six signs published UK reports flag most often

The Smartphone Free Childhood community and the Wait Until 8th forums describe a consistent shortlist of warning signs. Captured here as published UK press interviews describe them.

1. First thing they reach for in the morning, last thing they look at at night. Not occasionally. Every day, without fail.

2. Sleep is shorter and worse. Tired in the morning. Resists going to bed. Bedroom door closed by 9, lights off by 10.30. The phone is in the room.

3. The pre-phone hobbies have gone quiet. The bike, the trampoline, the books, the Lego in the same place untouched for weeks.

4. Mood changes when the phone goes, even briefly. Withdrawal, anger or tears at thirty minutes, an hour, a school day without it. Disproportionate to the brief absence.

5. Lying has appeared. Says they were doing homework when the phone history says otherwise. Screen tilts away when you walk into the room.

6. The friendship picture has narrowed. Face-to-face friend group is smaller, named social-media contacts have grown. Not a problem on its own. A problem when it’s the only direction of change for six months.

Three or more, sustained for a school term, is a signal worth acting on.

What’s worked, in published UK reports

Rough order of how often it appears.

Get the phone out of the bedroom at night. The single most-cited move. Phone charges in the kitchen from 8pm. Sleep recovers in about a fortnight. Sleep is the first thing most parents notice come back.

Turn off the apps, not the phone. If a smartphone is the right device for school or for other reasons, delete the four apps (TikTok, Instagram, Snapchat, WhatsApp) and turn on Apple Screen Time properly. The phone stays. The algorithmic feed goes. The friend-network workaround for WhatsApp is at /notes/03-replacing-whatsapp.

Step back to a basic phone. The harder reset. Sell or store the smartphone. Give the child a Nokia 3210 or a Light Phone III. First fortnight is hard. Month two is calmer than the family expected. Long-form guide: /notes/05-stepping-back-from-smartphone.

Don’t negotiate under emotional pressure. The most common failure mode in published UK coverage is returning the phone (or restoring the app) in week two because the child is upset. The decision shouldn’t move under tears in the moment.

Get one other family to do it at the same time. The single biggest predictor of an easy first fortnight is whether one or two other families in the friendship group make the same change in the same window. The friend-network briefing at /switching-kit is the paragraph designed to make that conversation simple.

When to escalate

If three of the six signs above are present, and any of the following are also present, raise it with your GP, the school SENCO, or, where one is available locally, an NHS Children and Young People’s Mental Health Service. Self-harm or talk of self-harm. A sustained drop in eating. School refusal. Aggression that’s new in your child’s behaviour. None of those are caused by phones alone. They’re signals that whatever’s going on at home and at school has tipped past the household’s capacity to manage.

What not to do

Don’t buy monitoring software and read the messages without telling them. Don’t threaten to take the phone away without doing it. Don’t return the phone in week two because week one was hard.

Talk to your child. Calmly, not in the moment, when neither of you is holding a phone. The seven-moment script was written for a different conversation, but the structure works for this one too.

Next steps

• The published evidence summary: /the-risks is the plain-English read.
• Decided to step back to a basic phone: /notes/05-stepping-back-from-smartphone is the long-form guide.
• Want to talk it through: hello@knockphone.co.uk. No charge, no sales call, no judgement.