Every cell tower has a unique address on the network. When a device is connected to a tower, the network knows that address and can pass it to anyone authorised to ask - including Simbase. From the address, Simbase looks up the tower's geographic location and shows it on your dashboard, no GPS required.
This article explains what a Cell ID is, the four IDs together that identify a tower uniquely, and what kind of accuracy you can expect from Cell ID-based location.
What identifies a cell tower
A single Cell ID is unique within an operator's network, but not globally - operator A's cell 12345 and operator B's cell 12345 are different physical towers. To identify a tower uniquely you need four values:
| Identifier | Stands for | What it tells you |
|---|---|---|
MCC | Mobile Country Code | Which country the tower is in (e.g. 234 = UK, 310 = US) |
MNC | Mobile Network Code | Which operator owns the tower within that country (e.g. 410 = AT&T, 260 = T-Mobile US) |
LAC | Location Area Code | A group of cells the network treats as one paging area |
Cell ID | Cell Identity | The specific cell within the LAC |
MCC
MNC
LAC
Cell ID
How Simbase uses Cell ID
When a Simbase SIM attaches to a network, the network passes the tower's identifiers to Simbase as part of normal session signalling:
Simbase receives the four-tuple (MCC, MNC, LAC, Cell ID) for the SIM's current attach.
Looks the tower up in Simbase's cell-tower database to get latitude / longitude.
Stores that location against the SIM, time-stamped.
Shows it on the map in the dashboard and exposes it via the API.
You don't have to do anything for this to work - it happens automatically as long as the SIM is attached and is active on the network.
Accuracy
| Environment | Typical cell coverage radius | Expected location accuracy |
|---|---|---|
Dense urban (cities) | 100–500 m | Hundreds of metres |
Suburban | 0.5–2 km | Up to ~2 km |
Rural | 2–10 km | Several kilometres |
Highway / remote | 10–30 km | Up to tens of kilometres |
Dense urban (cities)
Suburban
Rural
Highway / remote
For comparison, GPS is typically accurate to within 5–10 metres in open sky.
When Cell ID is useful
Cell ID is the right answer when:
You need a rough location for fleet monitoring, asset tracking, or geo-context, not pinpoint location.
The device doesn't have GPS (cost, battery, or design constraints).
The device has GPS but isn't getting a fix (indoors, urban canyon, underground).
You need location for every SIM in the fleet without firmware changes. Cell ID works for any device that attaches to a Simbase network.
You want a passive backup to GPS, log Cell ID alongside GPS so you have something when GPS drops.
When Cell ID is not enough
Don't rely on Cell ID alone when:
You need device-level precision (asset recovery, geofencing within a building).
You need to distinguish movements within a single cell - Cell ID won't change.
Latency matters and you can't tolerate position updates only on attach or handover.
You're operating where cell coverage is sparse and individual towers cover huge areas.
For those use cases, pair Cell ID with GPS or another location technology.
Accessing SIM location
In the dashboard: Open the SIM and look at the map view, or the location field in the SIM details.
Via the API: The location for each SIM is exposed in the API response for the SIM resource. See the Simbase Developer Portal.
Both surface the latest known location and the timestamp of when it was last updated. If a SIM hasn't been online recently, the location will be the last attach point.
Common questions
It depends on cell size. In dense urban areas expect a few hundred metres; in rural or remote areas it can be several kilometres or more, because a single tower covers a much larger area. For comparison, GPS is typically accurate to 5–10 metres.
No. Cell ID location works from the network alone, with no GPS hardware, firmware changes, or device configuration. It's available for every SIM that attaches to a network, though it's less precise than GPS.
On attach and handover, not continuously. A stationary device that stays on one tower won't produce new updates, and a device moving within a single cell won't either. The dashboard shows the last known location with the time it was recorded.
Cell ID reports the tower's location, not the device's. A device several kilometres from the tower it's attached to will appear at the tower. This is expected behaviour rather than an error, and it's the main reason to pair Cell ID with GPS when you need real precision.
Related
SIM state, what "online" means and how to interpret last-seen
Diagnostics, see attach history per SIM
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