Which Fair Policy is applied for the unlimited devices?

This service is based on a mobile connection and if you use it intensively you subtract bandwidth from all other users connected to the same cell (antenna).
For this reason, all the operators apply "fair policy" rules and may suspend a sim even in the case of "unlimited" data plans, if it uses a significantly higher volume of data than national averages.
The operator we use (WindTre) has the right to suspend a SIM if its average data consumption exceeds 20 GB/day (24-hour based) for more than 3 days. There are many other factors that contribute to the possible suspension, but the important thing is that if the sim is suspended by the operator, we must open a case, and generally the reactivation takes place in 2-3 business days.

For this reason, to avoid long suspensions, we apply our own "fair policy" and if the data usage exceeds 20 GB/day for 3 consecutive days, we limit the data connection to 20 GB/day for the following 3 days.
This avoids a suspension by the operator and lets you connect every day. After 3 days, the limit is removed and you are able again to have unlimited data.

To better understand this value, please consider that 20 GBs lets you watch movies as follows:
 - about 28 hours with video quality set to “standard” (720p) - average consumption of about 0,7 GB per hour;
 - about 8 hours with video quality set to “HD” (1024p) - average consumption of about 2,5 GB per hour.

In case of suspension, you will see "Internet not available" on your device until midnight. After midnight, the data connection is automatically re-enabled and you will be able to use your device again!