People with serious mental illness (SMI) prefer texting to downloading mobile treatment applications. About 75% of people with mental illnesses such as depression, bipolar disorder, schizophrenia, or anxiety own mobile phones. Half own a phone with a few features such as text, camera, video recorder, or Internet access; however only 17% own a smartphone. Of those who own or share a mobile phone, 78% use the phone to send text messages; 68% use the phone to take pictures; and 43% use the phone to access the Internet. About 20% use the phone to download and use applications. About 26% use . . .