Mobile Phone Networks and Faults

Question 1

What is a mobile phone network?

Accepted Answer

A wireless communication system distributed over land areas called cells, allowing mobile phones to communicate and access the internet.

Question 2

Which mobile network standard is most widely used globally and relies on a Subscriber Identity Module (SIM) card?

Accepted Answer

GSM (Global System for Mobile Communications)

Question 3

Unlike GSM, which older network standard historically did not require physical SIM cards, as the phone's identity was programmed directly into the device hardware?

Accepted Answer

CDMA (Code Division Multiple Access)

Question 4

What key services were introduced with the 2G (Second Generation) network standard, primarily relying on GSM technology?

Accepted Answer

Digital voice transmission and basic data services like Short Message Service (SMS).

Question 5

Which network standard brought faster data transfer speeds, enabling video calling, mobile internet access, and GPS tracking?

Accepted Answer

3G (Third Generation) Network

Question 6

What is a primary characteristic of 4G LTE (Fourth Generation Long-Term Evolution) networks?

Accepted Answer

High-speed mobile broadband internet, high-definition video streaming, and Voice over LTE (VoLTE) services.

Question 7

The latest mobile network standard, offering ultra-high-speed data transfer, extremely low latency, and the capacity to connect a massive number of devices simultaneously, is known as:

Accepted Answer

5G (Fifth Generation) Network

Question 8

A mobile phone showing weak signal bars or 'No Service' might have a fault in which hardware component?

Accepted Answer

Faulty Antenna or Antenna Contacts

Question 9

Damage to the Network IC (Integrated Circuit), often caused by liquid intrusion or physical drops, typically results in what symptom?

Accepted Answer

Prevents the phone from detecting any network.

Question 10

If a phone displays 'Insert SIM' or 'No SIM Card,' which hardware component is most likely damaged?

Accepted Answer

Damaged SIM Card Slot or Tray

Question 11

When a mobile phone is programmed to work only with a specific network provider, displaying 'Invalid SIM' with a local SIM, this is known as a:

Accepted Answer

Foreign Network Lock (Carrier Lock)

Question 12

What is the consequence if a phone's International Mobile Equipment Identity (IMEI) is corrupted, showing 'Null' or '00000000000000'?

Accepted Answer

The network provider will reject the device connection.

Question 13

If a phone is reported lost or stolen, its IMEI is added to a global database of blocked devices. What is the result of this action?

Accepted Answer

It prevents the phone from connecting to any mobile network.

Question 14

Which of the following is a widely used hardware flasher and software tool in GSM repairs, supporting various chipsets and used to read unlock codes, write firmware, and repair IMEI numbers?

Accepted Answer

Miracle Box

Question 15

Which professional device servicing tool is primarily used for unlocking, flashing, and repairing Samsung, LG, and Huawei mobile devices?

Accepted Answer

Octopus Box / Octoplus

Question 16

Before connecting a network-locked mobile phone to a computer for unlocking, what crucial setting must be enabled on the phone?

Accepted Answer

USB Debugging

Question 17

What number should a technician dial on a mobile phone keypad to verify its IMEI status?

Accepted Answer

*#06#

Question 18

After inserting a local SIM card and powering on the phone, what should a technician observe on the top right corner of the phone screen to confirm initial network functionality?

Accepted Answer

Signal bars

Question 19

If a phone displays 'No Service' or 'Emergency Calls Only' after inserting a SIM, what is the next diagnostic step a technician should perform?

Accepted Answer

Perform a Manual Network Search.

Question 20

Which tool is used to desolder and replace faulty network components, such as the Network IC or antenna contacts, on a mobile phone's Printed Circuit Board (PCB)?

Accepted Answer

Workstation (Hot Air Rework Station)

Strong work.

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