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https://tractive.com/blog/en/tech/gps-tracker-without-sim-card#:~:text=Do%20GPS%20trackers%20need%20a%20SIM%20card%20to%20work?,to%20the%20local%20mobile%20network.

Do all GPS trackers need a SIM card?

Do GPS trackers need a SIM card to work? Technically, no. As mentioned above, there are some types of GPS tracker that contain SIM cards, as well as simless GPS trackers. For example, the navigation system in your car is one type of GPS tracker that does not require a SIM card. On the other hand, the average dog or cat GPS tracker contains a SIM card in order to make real-time tracking possible. Among GPS trackers with a SIM card, some are exchangeable and some are non-exchangeable.

Why do GPS trackers need a SIM card?

Many wonder why so many GPS trackers require a SIM card. After all, there are simless GPS trackers out there. It’s a good question, seeing as your phone GPS can technically work without a SIM card. So, once more, why do so many GPS trackers require SIM cards?

Here’s the short answer. If you want to send GPS location from one device to another (from your GPS tracker to your phone, for example), you’ll need a SIM card so that the two can “communicate”. The data gets sent by SMS from your tracker to your phone, all thanks to its SIM card.

What’s the benefit of having a GPS tracker with a SIM card?

Wireless communication between devices: The advantage of a built-in SIM card in your tracker is that it’s connected to the local mobile network. That means it can communicate with other devices. Say you put a GPS tracker in your child’s backpack* on their first day walking to school alone to make sure they get there safely. The tracker’s SIM card lets it forward location data to your phone. Without a SIM card in the GPS tracker, this would normally not be possible.

Real-time tracking: A SIM card also lets you track every moment. For example, Tractive GPS lets you go into LIVE Mode to get location updates every 2-3 seconds, and know your cat or dog is safe and sound. All that is made possible by the tracker’s integrated SIM card.