It looks like if millennials had their way, phone calling would be a thing of the past. 78% of millennials said they'd prefer a phone plan with no calling and unlimited data. Millennials are much more inclined to use social media, which requires data, says Business Insider. Almost all social media usage these days happens on mobile phones. 74% of millennials also said they'd opt for a flat-rate plan rather than pay for what they actually use.