TK905 problem since change of SIM Carrier

JayRD

Hello,

I am reaching out for assistance regarding multiple GPS trackers that are no longer responding to SMS commands after we switched mobile carriers.

I have tried all available methods, reset commands, and SMS codes. When I insert the SIM card into the GPS unit, the yellow light stays solid, and the blue light eventually starts blinking. However, none of the reset or APN configuration commands are being accepted.

To troubleshoot, I tested multiple SIM cards. Whenever I insert the SIM into my mobile phone, I immediately receive all the SMS commands I had previously sent—which confirms that the SIM cards are functioning correctly. However, when inserted in the GPS device, it seems like none of the commands are being received.

Additional Information:

Country: Canada

Carrier: TELUS (confirmed 4G compatibility)

Network Frequency Bands:

4G LTE/LTE Advanced: 2100 MHz (downlink) / 1700 MHz (uplink) AWS, 1900 MHz, 700 MHz, 850 MHz

HSPA: 850 MHz and 1900 MHz (UMTS)

Since switching carriers, none of the GPS units are responding, and we are unable to configure the APN or reset them via SMS.

My Questions:

Is there another way to program or reset these devices manually (for example via cable or configuration software)?

Are there updated APN settings or firmware requirements for compatibility with TELUS 4G LTE in Canada?

What steps do you recommend to restore connectivity and command functionality?

Your prompt support would be greatly appreciated, as these devices are critical to our operations.

Thank you

kuta

JayRD

Based on your description, it’s very likely that the issue is related to network compatibility.
Your GPS trackers probably support only 2G/3G connectivity, while your new carrier TELUS operates on 4G and 5G networks only.

Because of this, the trackers cannot register on the network — which is why they don’t receive SMS commands and can’t connect to the platform.

We recommend the following steps:

Check the technical specifications of your trackers to see if they support the network types used by TELUS (LTE bands).
Try SIM cards from another operator that still supports 2G or 3G networks.

Regarding configuration without SMS commands — it depends on the model and manufacturer of your trackers.
Some devices can only be configured via SMS, while others also support setup through configuration software or USB tools.
We can give you a more precise answer if you let us know the exact tracker model.

If you have additional questions, please send us at support@gps-trace.com your account login, tracker ID, tracker model, and screenshots of the configuration — we’ll check the details and do our best to help.