From the DSM-V, the fifth edition of the American Psychiatric Association’s (APA) Diagnostic and Statistical Manual of Mental Disorders:
Early on-set textophilia is accompanied with feelings of euphoria, wholeness and exuberant empowerment, soon followed by social and environmental seclusion. Symptoms include an inability to look up, walk with eyes forward, complete full sentences, or engage in uninterrupted physical conversation for bursts longer than 60 seconds.
Without treatment, patients regard texting as more real than flesh-to-flesh communication. This feeling is reinforced by quick dopamine and oxytocin hits to the brain.
In advanced cases (25+ texts per day) life without texting becomes unbearable, empty and meaningless. At this stage, textophiliacs develop an inability to distinguish cognitively between device and existence.
Sudden withdrawal can lead to total collapse of identity and rediscovered freedom.