netflix always starts at the lowest bandwidth and increases as it sees that more bandwidth is available, adjusting as necessary so that there is a minimal skipping.
Per netflix, the tiers are as follows:
https://account.netflix.com/HdToggle
- Good quality (up to 0.3 GB per hour)
- Better quality (up to 0.7 GB per hour)
- Best quality (up to 1 GB per hour, or up to 2.3 GB per hour for HD)
Based on that, 2.3GB per hour is around 5.1mbps. There is no way that you would be able to get that bandwidth on Verizon 3G which is 1xEVDO Rev. A, which has a theoretical cap of 3.1mbps, though, I have personally seen about 2.1mbps max. Either way, it is below the 5.1mbps needed for Netflix HD streaming.
And, realistically speaking, if you are in a crowded 3G area you are most likely streaming at "Good Quality" which is 700kbps. It would be possible to stream at "Better quality" which is 1.6mbps, but, at least where I am, 3G rarely gets above 1mbps, and usually, lower.
This of course is in contrast to Verizon 4GLTE, I have seen speeds in excess of 60mbps, and typically see around 8-12mbps during peak times.