Problematic smartphone use also known as smartphone overuse, smartphone addiction, mobile phone overuse, or cell phone dependency, is proposed by some researchers to be a form of psychological or behavioural dependence on cell phones, closely related to other forms of digital media overuse such as social media addiction or internet addiction disorder. Other researchers have stated that terminology relating to behavioural addictions in regards to smartphone use can cause additional problems both in research and stigmatisation of users, suggesting the term to evolve to problematic smartphone use. Problematic use can include preoccupation with mobile communication, excessive money or time spent on mobile phones, use of mobile phones in socially or physically inappropriate situations such as driving an automobile. Increased use can also lead to increased time on mobile communication, adverse effects on relationships, and anxiety if separated from a mobile phone or sufficient signal. Founded in current research on the adverse consequences of overusing technology, 'mobile phone overuse' has been proposed as a subset of forms of 'digital addiction', or 'digital dependence', reflecting increasing trends of compulsive behaviour amongst users of technological devices. Researchers have variously termed these behaviours 'smartphone addiction', 'problematic smartphone use', as well as referring to mobile phones (cell phones) rather than solely smartphones. Forms of technology addiction have been considered as diagnoses since the mid 1990s. Panova and Carbonell published a review in 2018 that specifically encouraged terminology of 'problematic use' in regard to technology behaviours, rather than continuing research based on other behavioural addictions. Unrestrained use of technological devices may affect developmental, social, mental and physical well-being and result in symptoms akin to other behavioural addictions. However, the Diagnostic and Statistical Manual of Mental Disorders has not formally codified the smartphone overuse as a diagnosis. Gaming disorder has been recognised in the International Classification of Diseases (ICD-11). Varied, changing recommendations are in part due to the lack of well established evidence or expert consensus, the differing emphasis of the classification manuals, as well as difficulties utilising animal models for behavioural addictions. Whilst published studies have shown associations between digital media use and mental health symptoms or diagnoses, causality has not been established, with nuances and caveats of researchers often misunderstood by the general public, or misrepresented by the media. A systematic review of reviews published in 2019 concluded that evidence, although of mainly low to moderate quality, showed an association of screen time with poorer psychological health including symptoms such as inattention, hyperactivity, low self esteem, and behavioural issues in childhood and adolescence. Several studies have shown that females are more likely to overuse social media, and males video games. This has led experts to suggest that digital media overuse may not be a unified phenomenon, with some calling to delineate proposed disorders based on individual online activity. Due to the lack of recognition and consensus on the concepts, diagnoses and treatments are difficult to standardise or recommend, especially considering that 'new media has been subject to such moral panic.' International estimates of the prevalence of forms of technology overuse have varied considerably, with marked variations by nation. Prevalence of mobile phone overuse depends largely on definition and thus the scales used to quantify a subject's behaviors. Two scales are in use, the 20-item self-reported Problematic Use of Mobile Phones (PUMP) scale, and the Mobile Phone Problem Use Scale (MPPUS), which have been used both with adult and adolescent populations. There are variations in the age, gender, and percentage of the population affected problematically according to the scales and definitions used. The prevalence among British adolescents aged 11–14 was 10%. In India, addiction is stated at 39-44% for this age group. Under different diagnostic criteria, the estimated prevalence ranges from 0 to 38%, with self-attribution of mobile phone addiction exceeding the prevalence estimated in the studies themselves. The prevalence of the related problem of Internet addiction was 4.9-10.7% in Korea, and is now regarded as a serious public health issue. Behaviors associated with mobile-phone addiction differ between genders. Older people are less likely to develop addictive mobile phone behavior because of different social usage, stress, and greater self-regulation.