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220-1201 Practice Question: A user's smartphone can send and receive text…
A user's smartphone can send and receive text messages but cannot access the internet over cellular data. Wi-Fi internet works fine. Which setting is most likely misconfigured?
⚠ Common exam trap
The 220-1201 exam often tests the APN setting as the root cause for 'SMS works, no cellular data' because many candidates mistakenly think SMS and data use the same network path, but SMS uses the signaling channel (SS7/IMS) while data requires a separate PDP context through the APN.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The APN settings are incorrect.
The APN (Access Point Name) defines the gateway between the mobile network and the internet. If the APN settings are incorrect or missing, the device can still register on the cellular network for voice and SMS (which use the control plane) but cannot establish a data session (user plane) because the packet data network gateway cannot be reached. Wi-Fi internet works fine because it bypasses the cellular data path entirely.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The Wi-Fi hotspot is enabled.
Why it's wrong here
Enabling the Wi-Fi hotspot on a smartphone utilizes the device's existing cellular data connection to create a wireless access point for other devices. If the hotspot is active, it inherently means that the cellular data connection is functional and being shared. Therefore, an enabled Wi-Fi hotspot would not be the cause of the smartphone itself being unable to access cellular data; rather, it confirms the data connection is working.
- ✓
The APN settings are incorrect.
Why this is correct
APN (Access Point Name) settings are critical configuration parameters that dictate how a mobile device connects to the internet via its cellular carrier's network. These settings specify the gateway and protocols required for data transmission. If the APN settings are incorrect, misconfigured, or missing, the device will be unable to establish a data connection, preventing internet access, while basic services like SMS and voice calls, which often use separate signaling channels, may continue to function normally.
- ✗
Bluetooth is turned on.
Why it's wrong here
Bluetooth is a short-range wireless communication technology designed for connecting peripherals and devices over a limited distance, such as headphones or car kits. It operates on a distinct radio frequency and protocol stack entirely separate from the cellular data network (e.g., LTE, 5G). Consequently, whether Bluetooth is turned on or off has no direct impact or bearing on the smartphone's ability to connect to or utilize its cellular data connection for internet access.
- ✗
The device is in roaming mode.
Why it's wrong here
Roaming mode indicates that a mobile device is connected to a cellular network operated by a different carrier than its home provider, typically when the user is outside their primary service area. While roaming can sometimes lead to data restrictions or additional charges, it does not inherently prevent cellular data from working. The ability to send and receive SMS messages suggests the device is successfully connected to a cellular network, making incorrect APN settings a more direct cause for data failure than simply being in roaming mode.
Go deeper
Related to this question
Learn chapter
Mobile Device Types and Features
Key term
Access Point
An access point is a device that creates a wireless local area network, usually by connecting to a wired network and broadcasting a Wi-Fi signal for computers, phones, and tablets to join.
Key term
Packet
A packet is a small unit of data that is sent over a network, containing both the actual data and control information for delivery.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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