While others across the industry battle it out over 10-gig claims, Google Fiber is looking to go bigger, plotting the rollout of a symmetrical 20-gig service for select residential and business cus | The service will use Nokia's 25G-PON gear and initially be available later this year as an invite-only product.
I think you are mistaking bandwidth limits with data caps?
At some point all devices have a bandwidth limit. Even if you somehow had a 10gb/sec phone data connection (which is absolutely not possible) your phone device literally cannot transfer data that fast.