1. Scenario overview
A traffic pool is a billing model where many SIMs share one allowance. A single-SIM plan bills that SIM on its own. Overage management decides what happens after the allowance is gone. In a pool, SIMs draw from the same total. If SIM A uses 10GB and SIM B uses 1GB, the unused part of B is available to A, so you stop buying data that sits idle. That fits connected vehicles, shared devices, and an enterprise private network, where usage swings.
On the SimtoLink IoT Cloud Platform you create the pool, add or remove SIMs, see pool usage, and warn or act when it runs over. The pool stays in step with China Mobile, China Unicom, and China Telecom. You can run more than one pool, split by project or by customer.
2. Core capabilities
Create the pool and manage SIMs
Create a pool by project, customer, or line of business, and set the capacity, for example 100GB/month, and the billing cycle. Several pools can exist at once, and they do not share with each other. A SIM can move from a single-SIM plan into a pool, or leave one pool and join another, including in bulk. SIMs in the pool share the total. A SIM has no cap of its own unless you set one.
Sharing and the overage policy
The pool is one allowance. Each SIM takes what it needs, so a quiet SIM offsets a busy one. When the pool is used up, the policy can suspend, charge overage, or raise an alert, through overage management. Suspend or usage-based billing, then traffic billing splits the cost inside the pool.
Usage and spotting overage
See the pool total, what is left, and a ranking of each SIM, as it happens. Roll it up by day, week, or month for cost and for a SIM that looks wrong. When the pool goes over, it is marked and can fire a traffic alert, a suspend, or usage-based billing. Traffic statistics are where you read the trend.
Carrier integration
The pool talks to China Mobile, China Unicom, and China Telecom. Creating the pool, adding a SIM, and syncing usage match the carrier side, so the bill is the same on both. The carrier has to offer a pool. All three do, which is what you need for a compliant charge that agrees with theirs.
3. How a pool runs
4. A pool, a single-SIM plan, and overage
A traffic pool, a single-SIM plan, and overage management answer different questions.
| Dimension | Traffic pool | Single-SIM plan | Overage management |
|---|---|---|---|
| Focus | Sharing and balancing across SIMs | One SIM, billed on its own | What to do after the allowance is gone |
| Core capabilities | Create the pool, add or remove SIMs, usage, spotting overage | Subscribe to a plan, a usage cap, a bill of its own | Usage-based billing, suspend, throttle, automatic add-on |
| Where it fits | Usage that swings, shared across SIMs | Usage you can estimate, one SIM on its own | After a plan or a pool is used up |
| What teams need | A smaller purchase, and room to rebalance | A cap you can hold on one SIM | Continuity on one side, cost control on the other |
They work as a set. The pool is the sharing. Overage management sets the policy after the allowance is gone. Traffic billing splits the cost inside the pool.
5. Typical use cases
- Connected vehicles: many vehicles share one pool. When one vehicle uses more than another, the pool absorbs it and you buy less unused data.
- Shared devices: power banks, bikes, and similar fleets share a pool, so uneven use does not leave data sitting on a quiet device.
- An enterprise private network: several departments and projects share a pool, and cost is split by project or department for internal books and budgets.
6. Why it matters
A traffic pool on the SimtoLink IoT Cloud Platform is how you spend less on data. Sharing across SIMs stops one quiet SIM from wasting its allowance. Where usage swings, you buy a pool instead of a peak for every SIM. With overage management and traffic billing, you set what happens when the pool runs out and how the cost is split. A tenant isolates data. A pool shares data across SIMs. Those are different jobs.
7. Implementation notes
Split pools by project or by customer, and set a capacity that matches the work. Look at pool usage on a regular cadence and move SIMs if the mix is wrong. Decide the overage policy before you need it: suspend, or bill on usage. Grow or shrink the capacity as the business changes. SimtoLink can help you configure the pool and connect it to the carrier.