● You have an unlimited data plan
● Your data usage falls within the top 5% of all Verizon customers. Currently that threshold is 4.7GB
● You have completed your contract term (you're a month-to-month customer)
● You are in an area that is experiencing high demand
Verizon is quick to note that it is not technically throttling customers. Instead it is 'implementing network optimization practices.' Verizon says that unlike throttling, you're speeds under network optimization will only be reduced if you are connected to a cell site that is under a heavy load (and your usage is already in the top 5%).
Verizon tells customers that they can switch to their usage-based data plans to avoid 'network optimization'
AT&T has been throttling their unlimited data customers on 3G (3GB) and 4G LTE (5GB) for years now as well. However on AT&T, once you reach either 3GB or 5GB (depending on if you're using 3G or 4G LTE) you will be throttled for the entire cycle, even if the cell site you are connected to is not experiencing a high demand.