Teltonika TAT100: set the APN by SMS for an IoT SIM

Updated 27 October 2026

To use an IoT SIM in the Teltonika TAT100, set its APN by SMS with parameter 2001, then point it to your server with parameters 2004 and 2005. The TAT100 is a 2G-only tracker: it stops working wherever its operators switch 2G off.

Key facts

Source: Teltonika wiki, TAT100, specifications. Checked 27 October 2026.

Set the APN by SMS

SMS format: <SMS login><space><SMS password><space><command><space><value>. Without an SMS login and password, start the message with two spaces.

  setparam 2001:<apn>
  setparam 2004:<server address>;2005:<port>

The first message sets the APN; the second sets the address and port of your tracking server. Both are built from the parameter numbers below.

Sources: TAT100 parameter list, TAT100 SMS commands.

The tracker switches between Home, Roaming and Unknown data acquisition modes: an operator in its roaming operator list means Roaming mode, the home operator (detected automatically) means Home mode, and any other operator means Unknown mode. A multi-network IoT SIM often lands in Roaming or Unknown mode: check the record and send periods set for those modes.

Send data to your server privately

With private delivery, set parameter 2004 to your server's private IP address: tracking data then travels from the SIM to your platform without crossing the internet, and the platform needs no public listening port.

Networks and shutdowns

• 2G only. Check the 2G shutdown dates of the countries where the TAT100 runs; for new installations, choose an LTE model.
• Permanent roaming rules apply to devices that stay abroad: see the rules by country.

The SIM: IoT SIM cards. Typical use: SIM card for GPS trackers.