Should toddlers be allowed to be on cell phones constantly?

What do you think? My neice is two and a half and my sister, who is twenty-three, thinks it's sooo cool that she can open the camera, check the weather, etc. on her phone. She always posts pictures with her daughter on the cell phone saying "always playing on a phone ❤️" like its a good thing. She doesn't want to go outside or play with toys if there's a phone. She'll reach for it. I just don't think that's healthy. 

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