Maybe I am using my phone wrong, but probably the largest bandwidth usage on my phone is watching 1080p youtube, which is.... probably no more than 20mbit/s? Spotify occasionally takes more than 2 seconds to load a podcast, and sending emails with 10mb attachments can take upwards of 3 seconds. I don't personally see the utility in having a 100mbit connection on my phone. Wifi is pretty ubiquitous if I need it for my laptop at faster speeds than that, generally wifi is available either for free, or for a few bucks (on an airplane).