How to size your IoT data plan

Oversizing the plan throws money away. Undersizing blows the bill on overages. This guide gives you the method to estimate, pick the plan type, and put controls in place to avoid surprises.

1. 1

   Measure real traffic for 4 weeks

   Deploy 5 to 20 real units and measure MB/device/day. Track peaks and mean. Four weeks is the minimum to catch weekly variability.

2. 2

   Add 30 to 50% margin

   Real fleets almost always burn more than pilots: firmware updates, occasional debugging, retries on bad coverage. 30% if your protocol is tight, 50% with video or voice.

   Tip: Document how firmware retries on error: silent loops blow consumption fast.

3. 3

   Pick the plan type

   Pay-as-you-go for small or very variable fleets. Per-SIM bundle for medium volume with predictable usage. Pooled for high volume where some SIMs use a lot and others almost nothing.

4. 4

   Negotiate volume scaling

   From 500 SIMs onward, list rates are negotiable. From 5k, demand specific terms: pooled bid, included static IP, overage discounts, etc.

5. 5

   Set usage alerts in the portal

   Define per-SIM and fleet thresholds: 80% of bundle warns the team, 100% blocks or notifies via SMS. Without alerts, a single faulty SIM can blow the plan a hundredfold in hours.

6. 6

   Review CDRs monthly

   Compare per-SIM usage to the expected curve. Spot outliers (buggy firmware, stolen device, malware). Block or investigate before the invoice lands.