Deleted member 4892
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A tracker can be blocked, but not as easily as suggested.
And yes, there are signal blockers that will block GSM signal as well, but they're expensive and they draw the attention of the authorities.
Beg to differ with this one!!!
We have recently come back from a visit to Caravan Guard in Hull to discuss products that knocked out 6 tracking devices bought from Amazon and eBay and factory fit tracking systems fitted to Z group of motorcaravans, which the devices not only jammed the GPS and GSM signals, but locates it and at the same time of demonstrating the product, also took out their local Wi-Fi causing a ruckus in their offices. Most bought individually for under £50.00, with only one of them costing £100.00 but in the grand scheme of things, paying out a bit towards bypass equipment compared to gaining a van, the pro's will try anything, including the by-pass equipment to re-write the factory immobilisation software (circa 900 euros).
These are just some examples of devices we have bought to test against equipment that is available and also to see how ours reacts to such devices.
I'm pleased to say our Non-Starter immobilisation/location unit not only sent through a "jamming attempt" warning to the customer's phone, but the sirens of the alarm are also triggered at the same time.
You also relying on a single network sim and not a multi-network roaming sim, therefore dependant on that sim being as reliable as it can be, rather than latching on to any network in the area.