Data loggers and meters on a small plan

A 50 MB plan can be enough for a logger or meter sending small readings at sensible intervals. Calculate report size multiplied by report count, then add connection traffic and updates before choosing it. For a fixed site with suitable O2, Vodafone or Three coverage, start with UK 3-network 50 MB at £0.65 per active SIM per month.

The important number is data sent over the mobile connection, not simply the size of a reading stored inside the device. Ask the equipment supplier for a complete estimate or measure the installed system. The metering sector page covers this use case for one device or a handful.

Start with the reporting interval

Choose an interval that supplies the information the receiving system actually needs. A daily total, hourly reading and minute-by-minute record produce different report counts. Keep that operational requirement separate from the desire to choose the smallest plan.

Check whether the logger sends each reading immediately or collects several into one transmission. Use the behaviour of the exact model and configuration. Do not assume that a device sampling frequently must transmit every sample separately, or that a small reading means a small complete transmission.

Include additional events such as status messages and any maintenance traffic your supplier identifies. If a router carries several meters, the SIM allowance covers the combined traffic, so estimate every connected device rather than just the first one installed.

A worked reporting calculation

Assume one complete report uses 1 KB and the meter sends a report every 15 minutes throughout a 30-day month. These are example inputs, not standard figures for meters. For the arithmetic, use 1,000 KB as 1 MB.

With an additional assumed 10 MB of other monthly traffic, the 15-minute example totals 12.88 MB. That fits comfortably within 50 MB. The one-minute example totals 53.2 MB using the same extra traffic and would need a larger allowance.

This shows why 50 MB is often plenty for small, infrequent reports but cannot be promised for every logger. Change the assumed report size to match the actual transmission. A download for maintenance also needs its own line in the estimate. How much data a device needs explains the measurement approach.

Check NB-IoT compatibility

ThingSIM supports NB-IoT. If your logger or meter is designed to use it, confirm the exact device requirements and intended installation with the supplier. Do not infer compatibility merely because the equipment is described as low power or intended for remote monitoring.

Ask how the selected reporting pattern relates to the device's power arrangements. The SIM's data allowance does not establish battery life, and NB-IoT support alone is not a battery-duration promise. Use the hardware supplier's instructions and test the chosen operating pattern.

Keep the connectivity choice tied to the actual data task. Confirm that a new reading reaches the intended platform, with the correct device identity, before declaring the installation complete. A mobile connection and a correctly configured receiving application are separate things to check.

Install at the final position

Check the physical SIM size or supported eSIM installation method before ordering. Physical ThingSIM cards provide mini, micro and nano sizes and are posted to UK and EU addresses. An eSIM arrives as a QR code minutes after ordering; either format costs £2.00 per SIM once.

Activate in the ThingSIM portal when you are ready to test. Billing starts that day, and SIMs arrive inactive. Copy the APN shown against the SIM into the device using the manufacturer's setup method, then send a test reading.

Test with the logger or meter enclosure closed and in its intended location. UK 3-network includes O2, Vodafone and Three, without EE. If the site needs EE among the available options, use UK 4-network instead. UK 4-network versus 3-network explains the choice.

Review usage after commissioning

Check the portal after representative operation rather than extrapolating only from installation traffic. Keep a note of reporting interval, connected devices and any update performed during that period. Repeat the review after a settings change or replacement device.

Plans offer 50 MB, 250 MB, 1 GB and 5 GB. At the allowance limit the SIM pauses instead of charging overage. Upgrade immediately, paying only the difference for the rest of the month, or wait for reset.

For several meters, running a small SIM fleet helps keep device names and SIM records matched. The API offers the same controls as the portal, and notifications lists usage events if you later want automated monitoring.

Common questions

Is 50 MB enough for a meter reporting every minute?

Calculate the complete report size and other traffic. In this guide's example, minute-by-minute reporting plus the assumed additional traffic exceeds 50 MB.

Does ThingSIM support NB-IoT?

Yes. Confirm that the exact logger or meter supports the required setup and is suitable for the intended deployment.

Should I choose UK 3-network for every fixed meter?

Only when the available networks suit the installed location. UK 4-network adds EE if that additional option is needed.