Practice Test Geeks(CMT) Certified Mobile Tech Practice Test
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Network Technologies & Connectivity Flashcards

7 cards from real CMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Network Technologies & Connectivity flashcards as text

  1. Which network technology uses Ultra-Wideband (UWB) for precise indoor positioning accurate to within centimeters?

    Answer: Apple AirTag / UWB spatial awareness

    UWB uses short pulses across a wide frequency spectrum to measure time-of-flight with centimeter-level accuracy, used in AirTags and precision finding.

  2. A technician is troubleshooting a device that cannot make emergency calls. The customer has no SIM installed. What should the technician tell the customer?

    Answer: Emergency calls (911) work on any available network even without a SIM

    In the US, mobile devices can place 911 emergency calls on any available carrier network even without a SIM card installed.

  3. What is the difference between GSM and CDMA cellular technologies regarding the SIM card?

    Answer: GSM uses a SIM card for subscriber identity; CDMA traditionally stored subscriber info on the device itself

    GSM networks use SIM cards to store subscriber identity, allowing easy swapping between devices, while legacy CDMA networks stored identity in the device's ESN/MEID.

  4. A repaired phone shows strong Wi-Fi signal but the connection drops every few minutes. The router and other devices are unaffected. What is the most likely hardware cause?

    Answer: Intermittent Wi-Fi antenna connection or damaged Wi-Fi module

    Periodic drops on a single device point to an intermittent antenna connection or a marginally damaged Wi-Fi chip that loses connection under thermal or physical stress.

  5. Which cellular technology is associated with CDMA networks and uses codes to allow multiple users to share the same frequency simultaneously?

    Answer: CDMA (Code Division Multiple Access)

    CDMA assigns unique spreading codes to each user, allowing all users to transmit simultaneously on the same frequency band.

  6. What is the purpose of an eSIM (embedded SIM) compared to a physical nano-SIM?

    Answer: eSIM is soldered to the motherboard and can be reprogrammed remotely with carrier profiles

    An eSIM is a permanently embedded chip that stores carrier profiles digitally, allowing users to switch carriers without physically swapping a SIM card.

  7. A customer traveling internationally reports their US phone shows 'No Service' in Europe. After confirming the phone is unlocked, what should the technician check next?

    Answer: Whether the phone supports the frequency bands used by European carriers (e.g., 900/1800 MHz GSM, B3/B7 LTE)

    Even an unlocked phone won't work internationally if its radio hardware doesn't support the frequency bands used by local carriers in that country.