The question is rarely "which technology is better" — it is "which technology fits which part of my fleet." GPS and SIM-based tracking solve the same problem with different trade-offs, and understanding those trade-offs is what saves money.
How each one works
A GPS tracker is a hardware device installed in the vehicle. It reads satellite positioning continuously and transmits it over a mobile data connection. SIM-based tracking installs nothing: with driver consent, the mobile network itself reports the location of the driver's SIM at set intervals.
Accuracy
GPS wins on precision — typically within a few metres, continuously. SIM location is derived from cell towers and is accurate to a few hundred metres in urban areas, wider in sparse rural coverage. For asset-grade questions (route adherence, ETAs, unauthorised stops) SIM accuracy is sufficient; for second-by-second telematics such as driving behaviour or fuel analytics, GPS is the right tool.
Cost and deployment
GPS carries per-vehicle hardware cost, installation time, and ongoing maintenance — devices fail, get tampered with, or vanish when a hired vehicle moves on. SIM tracking has zero hardware cost and onboards a vehicle in minutes, which is why it fits hired and market vehicles so naturally. You pay per tracked trip or per SIM, only while you need visibility.
Coverage and continuity
GPS works wherever satellites are visible but stops reporting if the device loses power or is removed. SIM tracking works wherever there is mobile network — which in India is nearly everywhere freight moves — but depends on the driver's phone being on and connected. Neither source is perfect alone, which points to the practical answer.
The hybrid reality
Mature fleets run both: GPS on owned vehicles where the hardware investment pays back over years of telematics data, and SIM tracking on the hired and attached long tail that would otherwise stay dark. Blended with FASTag toll-crossing records, the combination produces a continuous trail across the entire mixed fleet — every vehicle visible, regardless of ownership.
A simple decision rule
If you own the vehicle and will operate it for years, fit GPS. If the vehicle is hired, attached, or onboarded at short notice, use SIM tracking. If the cargo is high-value, use both and let each source verify the other.