An APN (Access Point Name) is the setting that tells a SIM-equipped device which gateway to use for mobile data — and the most common reason a GPS tracker never reports.
An APN — Access Point Name — is the address of the gateway between a mobile network and the internet. Every device using mobile data needs one, and it is specific to the network operator.
Phones handle this invisibly. They ship with a database of APNs for hundreds of carriers and configure themselves when a SIM is inserted. A €25 GPS tracker has no such database. If you do not tell it the APN, it has no route to the internet and will never send a position anywhere.
The failure is confusing because almost everything looks fine.
The SIM is working — you can verify it by putting it in a phone. The tracker powers on, the LEDs blink, it registers on the network. It accepts SMS commands and replies to them, which feels like conclusive proof that everything is connected.
But SMS and mobile data are separate services. A device can have full SMS capability and no data path at all. Position reports go over data, so they silently fail while everything you can easily test appears healthy.
The usual diagnosis is “the tracker is broken”. It almost never is.
Trackers are configured by SMS, using a syntax that varies by protocol family:
| Family | Command | Example |
|---|---|---|
| GT06 / Concox | APN,<apn># | APN,internet# |
| Coban / TK103 | apn123456 <apn> | apn123456 internet |
| Teltonika | setparam 2001:<apn> | setparam 2001:internet |
Some networks also need a username and password, which the command usually
accepts as extra parameters. Your carrier publishes the correct values; for many
European operators the APN is simply internet with no credentials.
Model-specific commands belong on the individual device pages rather than here, because the clones deviate from the published specs constantly. Sending the wrong syntax to some units puts them into a state that needs a factory reset.
Beyond the obvious “no positions”, a missing APN degrades things in ways that look like unrelated faults.
Slow fixes. A-GPS downloads satellite orbit data over the network. Without data, the tracker falls back to receiving that data from the satellites themselves, which takes minutes instead of seconds — or fails entirely under trees or indoors.
Inaccurate positions. With no satellite fix, some trackers fall back to LBS positioning, accurate to hundreds of metres or worse. If the device does have an SMS reporting mode, you may get positions that are wrong by a kilometre and conclude the GPS is defective.
Battery drain. A device that cannot connect keeps retrying. Repeatedly powering the radio and the GPS receiver for failed attempts drains a battery far faster than normal operation.
Some practical points that matter more than they sound.
IoT and M2M SIMs are usually the right choice. They are sold for exactly this, cost little per month for the tiny data volumes a tracker uses, and often roam across networks — useful, because a tracker that moves may find better coverage on a different operator.
Disable the PIN. A SIM with PIN lock enabled will not connect in a tracker, because there is no way to enter the PIN. Disable it in a phone first. This is the second most common setup failure after the APN.
Check the network generation. Many cheap trackers are 2G-only. 2G networks have been switched off in several countries — Australia, Switzerland, Singapore, much of the US — and are scheduled for shutdown in others. A 2G tracker in a country with no 2G is permanently offline, and no configuration will fix it. Check before buying, not after.
Data volume is negligible. A tracker reporting every five minutes uses single-digit megabytes per month. Pay for coverage and roaming, not for allowance.
See IMEI for how a tracker identifies itself to a server once the data connection is working.
Last reviewed 7 August 2026.
A-GPS (Assisted GPS) speeds up position fixes by downloading satellite orbit data over the mobile network instead of waiting to receive it from the satellites themselves.
An IMEI is the 15-digit serial number that uniquely identifies a mobile device, and on most GPS trackers it doubles as the only credential the device presents to a server.
LBS positioning estimates a device's location from nearby mobile network towers rather than satellites — far less accurate than GPS, but it works indoors and needs no fix.
GPS accuracy is how close a reported position is to the true location, usually expressed as a radius within which the real position probably falls.
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