Very often MNOs/MVNOs that supply services to SIM device owners sell shared pools. So, this allows customers to more effectively utilize the traffic if they have multiple SIM cards: i.e. companies/people can have devices that under-utilize their data allowance and devices that go over their allowance can borrow from the pool. Once SIM devices have exceeded their pool allowance, customers will be charged excess usage per KB/MB/min/SMS. Currently, shared pools can be assigned to 'sponsor' accounts with beneficiary accounts as volume discount plans. However, it's not possible to dynamically update quotas available within a shared pool when new SIM cards are activated (pool should be increased) or deactivated (pool should be decreased) | 