What Is an APN, and Why Does It Matter?
An Access Point Name (APN) is the gateway setting a cellular device uses to establish a data connection through a carrier's network to the public internet (or a private network). For a GPS tracker, an incorrect or missing APN is one of the most common reasons a device powers on, registers on the cellular network, but never successfully reports location data to a server.
Unlike a phone, a GPS tracker has no screen to manually browse network settings — the APN (along with server address and port) must be provisioned into the device directly, either via SMS command, USB configuration tool, or pre-configured at the factory for a known SIM/carrier combination.
SIM Provider vs. Network Operator
A frequent source of confusion: the company that sold the SIM card is not always the company that operates the physical cellular network the SIM connects to.
- Network Operator (MNO): Owns and operates the physical radio network (towers, spectrum, core infrastructure) — for example, a national carrier's LTE-M or NB-IoT infrastructure.
- IoT SIM Provider / MVNO: Resells connectivity, often across multiple underlying network operators and countries, under its own APN and billing plan. Global IoT SIM providers commonly issue their own APN string that differs from any single underlying carrier's consumer APN.
The correct APN always comes from whoever issued the SIM card — not necessarily the network the SIM happens to be roaming onto at a given moment.
LTE-M, NB-IoT, and Cat M1 — Terminology Note
Mictrack documentation and product pages refer to LTE-M & NB-IoT (with 2G fallback) as the connectivity option for long-life asset trackers such as MT700 and MT710. "Cat M1" is the 3GPP technical designation for the LTE-M radio category and may appear in carrier or module documentation as a technical synonym — it refers to the same underlying connectivity, not a separate network type.
How to Find the Correct APN for Your SIM
APN values are assigned by the SIM issuer and can change over time as carriers update their infrastructure — Mictrack does not control or guarantee third-party carrier APN values. To get the current, correct APN for your deployment:
- Check the SIM issuer's documentation or account portal — most IoT SIM providers publish their APN directly in onboarding materials or a self-service dashboard.
- Contact the SIM issuer's support line and ask specifically for the APN, along with whether a username/password is required (most M2M/IoT APNs do not require one).
- If using a standard consumer/business SIM from a national carrier rather than a dedicated IoT SIM, the carrier's own published APN settings apply.
Because APN values are carrier-specific and subject to change, this article intentionally does not publish a static country-by-country APN table — always confirm the current value directly with your SIM provider before deployment.
Configuring APN on a Mictrack Tracker
Mictrack trackers accept APN configuration through the Mictrack Config Tool (USB) or via SMS command, alongside the server address and port. If you purchased a pre-provisioned SIM bundle from Mictrack, the APN is typically pre-configured at the factory for that SIM — for any other SIM, the APN must be set manually before first deployment.
Roaming & Multi-IMSI IoT SIMs
Global IoT SIMs often use multi-IMSI or multi-network profiles that can roam across several underlying operators within one country or region. The APN for these SIMs is generally fixed by the SIM provider regardless of which underlying network the device is currently attached to — this is one of the main commercial advantages of a dedicated IoT SIM for multi-country fleets, and it's worth confirming with your provider whether their APN is uniform across all roaming networks they support.
Troubleshooting APN Connection Issues
- Device registers on the network but never reports: Almost always an APN, server address, or port misconfiguration — verify all three against your SIM provider's current documentation.
- Works in one location but not another: May indicate a roaming or coverage gap for the underlying network — confirm LTE-M/NB-IoT coverage at the deployment site with your provider.
- Intermittent connectivity: Check signal strength (CSQ) at the deployment location; NB-IoT in particular can be sensitive to weak signal in below-grade or heavily shielded installations.
Accuracy & Last-Verified Notice
Last reviewed: September 2026. Carrier and APN information changes over time and varies by SIM provider — this article describes the general process rather than a fixed table of carrier values. For device-specific configuration help, contact our engineering team or use the Mictrack Config Tool.
