I mean, if you have something specific you do over the phone, like in your case invest in stocks and so forth... no of course that's not an addiction. Don't know whether you actually ended up watching the documentary, but addiction is those who without anything specific or concrete they need to get done, spend their idle time thumbing through the phone. Also, there may be a time when a person (I've done it) will be stuck like in a waiting room or something with absolutely nothing to do but wait, and what the hell... might as well scroll through the phone. Some days it could add up to a few hours. In summary I think there are obviously worthwhile pursuits to do on your phone, like in your case investing. I have a brother who doesn't use his PC, so everything he would normally do on a computer he does on his phone. Me... I find that too uncomfortable for my taste. I like the comfort of a big screen and a human sized keyboard. Some things you can miniaturize only so much.