![]() If a mobile device can be universally identified, a thief cannot change the SIM card on a phone and expect to keep it. Their secondary purpose is to prevent theft. IMEI numbers have one principal purpose: To identify mobile devices. If you have a dual-SIM phone, you’ll see two IMEI numbers, one for each SIM slot. Since the IMEI standard is used for any terrestrial cellular network device, 3G/4G/5G tablets, laptops with older PCMCIA or newer integrated PCIe 4G LTE/5G wireless cards, and other mobile equipment are also tagged with these numbers. It’s called “terrestrial” because it uses planet-side antennas, not satellites, to connect. What is a terrestrial cellular network? It’s the network you use when you place a call on your cell phone or access an Internet connection provided by your cellular carrier through your data plan.
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