YMMV. I had one of the old grandfathered AT&T 'unlimited' plans. Within a short time after they stopped offering this plan to new customers, we started hittin

YMMV. I had one of the old grandfathered AT&T 'unlimited' plans. Within a short time after they stopped offering this plan to new customers, we started hitting a hard throttle at around 10 GB or something ridiculous like that. Once we hit it (after about two weeks at that time), it made the internet practically unusable for the rest of the billing cycle. Forget about streaming music or games - let alone video - there was a long wait even for text sites to load. We have since changed plans and I have been leery of the u-word ever since.