We have 3 main areas that uses data on the GW:
a) Sensors
b) Security updates
c) Time synchronization
The latter two are the most data heavy.
With the new GW-software the consumption should be below 800 MB/month for b) and c).
One sensor uses 50 kB/day or 600 kB/month.
500 sensors would use 293 MB/month.
The limit for one GW is 500 sensors and the calculation is then:
800 MB/month + 293 MB/month (500 sensors) = 1.093 MB/month (approx. 1 GB/month)
which is almost half of the recommended 2 GB data plan.