Pay-as-you-go means that only the actual data consumption of the active M2M SIM cards is billed.
One of our billing models is pay-as-you-go. This means that our customers only pay for the actual monthly data consumption of their M2M SIM card. No data package or similar has to be booked for the SIM cards in advance with this billing model. With pay-as-you-go, billing is in fair 1-KB increments, so there is no rounding up to 1 MB. You really only pay for the data that your M2M SIM has used.
In addition to pay-as-you-go, wherever SIM also offers other data rates, such as the data pool. This means that there is a suitable data tariff for every company project and plan.
Whether a fixed data package, pay-as-you-go or rather a data pool suits a project depends entirely on the project and the expected data consumption of your M2M SIMs.
A data pool is a shared data quota for all active M2M SIM cards. If one SIM consumes less and another consumes more, this consumption is offset against each other. In this way, individual outliers that would otherwise have caused additional costs can be offset by the lower consumption of other M2M SIM cards. Data pooling always makes sense when the total consumption of all SIM cards used is similar, but the consumption of individual SIM cards fluctuates greatly. So you know that you will consume about 100 MB a month across all 20 M2M SIMs, but not which of your SIMs will consume 30 MB and which only 5 MB this month.
Pay-as-you-go usually comes in handy when you don't know how much data the end device will consume, but it will tend to be less overall. This can be the case, for example, with SIM cards in alarm systems that only transmit data when they are used. From a certain regular minimum consumption, on the other hand, it makes more sense to book a monthly data package.