Looking for some flexibility with your plans? The group plan or "Pooled Plan" is a perfect option for devices with varying usage patterns. With the group plan, every SIM on the same plan type groups together to create an effective “Pool” of data, for example 4 x 5MB SIM cards gives you a pool of 20MB.
If your SIMs exceed your group limit, they will still keep operating but will result in excess usage charges billed at a per KB rate.