Mifi makes built in 3G unnecessary, even expensive or unpractical for some. I've got a laptop, Smartphone, & desktops at home. I have a Mifi that I can use for everything, but choose to have a Mifi & wired broadband, because my desktops are on 24/7, even when 4G comes out, I'll still have a Mifi & wired broadband. But this still saves me money instead of using 3G on my Smartphone & laptop. So "if" I do get a touchpad or portable mediaplayer with wifi, I'll still have flexibility & only pay for the mobile broadband of my Mifi.