The commenter quotes a review of mobile-phone use among children and adolescents covering visual, hearing…

https://www.researchgate.net/profile/Aqeel-Noaman/publication/336671998_Impact_of_Mobile_Phone_Usage_on_Some_Health_Aspects_of_Children_and_Adolescents_Evidence_Based_Review_Article/links/5dab6188a6fdccc99d91fa0f/Impact-of-Mobile-Phone-Usage-on-Some-Health-Aspects-of-Children-and-Adolescents-Evidence-Based-Review-Article.pdf

"Impact of Mobile Phone Usage on Some Health Aspects of Children

and Adolescents: Evidence Based Review Article"

"Eye health

Repeated use of the mobile phone for long periods of time harms the

visual system of the eye in different ways where it can cause eye tumor

due to the high temperature of the eye due to exposure to

electromagnetic radiation and close these radiation from the lens of

the eye increases the probability of eye exposure to cataract disease

later [8]. Bansal and Mahajan, 2018 found in a study of 450 Indian

children under 15 years of age in the pediatric department at the

teaching for tertiary care that more than one third of them ( 35.7%)

were suffering from eye symptoms including eye strain and eye

watering (8). In another recent study, which included 177 Saudi

students studying at a middle school in the city of Riyadh, their ages

ranged 12 to 116 years old, found that using the smartphone for more

than 28 hours a week causes visual disturbance [9].

Ear problem

Increase the temperature in the ear lobes by approximately 10 degrees

Celsius may cause auditory disturbances when using the mobile for a

period of 20 minutes continuously and for longer periods because the

radiation emitted from the mobile may cause damage to the sensitive

parts of the inner ear, as well as people who use phones including

children for 2-3 hours a day and for a period of 3-5 years may be

exposed to the occurrence of partial deafness and even may eventually

exposed to ear tumor or permanent hearing [8].

Neurological effects

Neurologically, the microwave radiation emitted from mobile phones

through the Wi-Fi device is mostly affects the head region [10]. In a

study carried out by Cerutti R, et al (2016) they revealed that exposure

the adolescents to some harmful effects like headache attacks and

other somatic problems as result to excessive use of mobile devices [11].

And exposure to headache was significantly associated with mobile

phone use among Twainish children in another study published in 2015

[6]. Recently, Jo Fowler and Jan Noyes, found that the children aged 11-

14 years in south west of England at risk of muscular skeletal problems

due to mobile use [4].

Psychiatric effects

In a recent study conducted in South Korea by Seong-Soo Cha and Bo-

Kyung Seo revealed that the lethargy and depression were more in risk

group (excessive mobile users) than the normal user group, and these

findings were tendency to significant difference [12]. But in another

study carried out on a group of Japanese young people aged 15-19

years, it revealed that the use of mobile phone for social networking

services, and conversation with others for two hours or more is

significantly linked to a high risk rate with depression [13]. Some studies

indicate that there is a correlation between the use of mobile phones

and stress, some of which negate this as it is difficult to interpret and

summarize the relationship between them [14]. Some researchers have

proven that mobile use causes increased stress and others have proven

the opposite [14]. In a study conducted on a group of high school

respondents, their mean age was 11.97 years [15]. The reason for this

may be that Children may experience various biological and

psychological changes during their lifetime for a daily period [15]. As for

the correlation between exposure to anxiety and the use of mobile

phones, two recent studies proved to have been set forth investigating

by Elhai, et al and another by Nassehi, et al [14]. They proved that there

is an important correlation between the occurrence of anxiety and the

use of mobile phones."

Sleep problems and brain tumor info was also mentioned in the article. But they take up more space than I have here.