Boost has a page on their site explaining the new option. It includes the scary graphic above showing how long 10 GB of data will last at various bitrates. According to Boost, at the throttled 600 Kbps rate, which Boost calls SmartStream, 10 GB is good for 37 hours of video. On the other hand, if you are using Enhanced streaming and you manage to find a 12 Mbps stream, your 10 GB will be gone in just 1.9 hours.
By default streaming services like NetFlix and YouTube detect the speed of your connection and adjust the quality to the highest that your connection can support. So enabling EnhancedStream should cause video apps to deliver higher quality video and that will result in higher data consumption.
In reality watching videos on a phone or tablet is unlikely to consume over 5 GB per hour as Boost's graphic suggests. That's because mobile streaming apps can't actually keep a 12 Mbps pipe full. Here are some numbers from mobile broadband provider Karma's blog detailing the estimated data consumption by the NetFlix and YouTube mobile apps:
- Low quality: 300 MB/hour
- Medium quality: 700 MB/hour
- High quality: 1 GB/hour SD, 2.8 GB HD
- 240p: 96 MB/hour
- 360p: 156 MB/hour
- 480p: 240 MB/hour
- 720p: 444 MB/hour
- 1080p: 744 MB/hour
About the only way to use up 10 GB in less than two hours is by using your phone as a hotspot to drive a PC, Smart TV or Roku player and use it to watch videos in NetFlix's Ultra HD mode which uses up to 7 GB/hour. The NetFlix mobile apps don't support Ultra HD.
EnhancedStream current only seems to be available to Boost Mobile subscribers. Virgin Mobile and Sprint Prepaid customers' video playback is still throttled to 600 Kbps.
Source Boost Mobile
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Prepaid Operator Profile: Boost Mobile