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AZUZ: Nomophobia is a term we came across when preparing our next story. It's a mash¹ up no-mobile-phobia. The fear of not having your smartphone or being connected with others through it.

Though the devices are a relatively² recent invention, an increasing number of people seemed to have developed a psychological dependence³ on them and that's getting researchers' attention.

LAURIE SEGALL, CNNTECH SENIOR TECHNOLOGY CORRESPONDENT: It's been 10 years since the iPhone debut⁴ and it's hard to imagine a world without the smartphone.

We use our smartphones to work, entertain, organize, do hundreds of daily tasks, even find love. We might jokingly say I'm addicted⁵ to my smartphone. But more and more, researchers are starting to agree.

UNIDENTIFIED FEMALE: So, think back to life without a smartphone.

SEGALL: Was there life without a smartphone?

There's no widely adopted diagnosis⁶ of smartphone addiction⁷, but for doctors like Hilarie Cash, not having an official diagnosis don't mean it isn't real.

DR. HILARIE CASH, FOUNDER⁸, RESTART: I'm still amazed at how many people do dismiss it as a silly idea — even plenty of people in my own field.

SEGALL: For those who specialized⁹ in technology addictions¹⁰, what goes on inside your head looked similarly to what goes on inside your head when you're dealing¹¹ with other addictions.

CASH: The regions of the brain that light up when engaged in to your smartphone, those are the same regions of the brain that are engaged when you're using those drugs and alcohol.

SEGALL: Dr. David Greenfield says it also affects your behavior.

DR. DAVID GREENFIELD, FOUNDER, THE CENTER FOR INTERNET AND TECHNOLOGY ADDICTION: In other words, you're using it like a drug — when you're triggered by burden, you're using it as an avoidance of sleep. You're using it to increase your mood when you're feeling a little down, or you're using it to avoid social situations when you walk into a party.

SEGALL: He warned it takes a trained professional to tell you if you're addicted to your phone. Self-diagnosing won't work.

That's because we're terrible at estimating how much time we actually spend online. A 2015 study found that people use their phones twice as much as they think they do.

You know, I actually think as human beings, we have less control than we think, right? Because we're kind of — we realize we're reaching to our phone all the time but we don't know why.

And I met a guy named Scott Dunlap. And he was fascinating. He spent much of his career building apps and using metrics to get us more addicted to our smartphone.

SCOTT DUNLAP, CHIEF PRODUCT OFFICER, BRILLIANT: The notifications that you get, there's reason they come at a certain time that they do. The words that are chosen in there — every character of that has been AB tested for you and your personality type. What we were in was the science of understanding what makes a product addictive¹².

SEGALL: Over 77 percent of Americans now own a smartphone. That's almost double since 2011. What is clear is that our relationship with our phones is changing. How we use phones in 2007 looks a lot different from life in 2017.

GREENFIELD: Normative use would be use that doesn't impact anything in your life. In other words, you use it to make a phone call. You use it for your GPS. You don't have it on the table when you're eating your dinner. You're using it but you're using it very moderately. Now, there are less and less people that are doing that.