Question 745 of 1,020

Mobile Device Network Connectivity →mediumMultiple ChoiceObjective-mapped

Cellular Data Not Working but SMS Works: APN Settings

This 220-1201 practice question tests your understanding of mobile device network connectivity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

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?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The Wi-Fi hotspot is enabled.
Why wrong: Enabling the hotspot would not prevent cellular data from working; it would share the connection.
B
The APN settings are incorrect.
APN (Access Point Name) settings are required for cellular data. If misconfigured, data will not work, but SMS and calls may still function.
C
Bluetooth is turned on.
Why wrong: Bluetooth does not affect cellular data connectivity.
D
The device is in roaming mode.
Why wrong: Roaming mode affects data when outside the home network, but the user is likely on their home network since SMS works.

Full breakdown with real-world context →

Quick Answer

The answer is that the APN settings are most likely misconfigured. Access Point Name (APN) settings define the gateway between your smartphone and the carrier’s data network, while SMS traffic travels over the control channel, which is separate from the data plane. This is why a user can still send and receive texts even when cellular data is not working but SMS works, because the device can authenticate and signal on the network without a valid APN. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of mobile network architecture and common troubleshooting steps; a frequent trap is assuming the SIM card is faulty or that airplane mode is to blame, but the key clue is that Wi-Fi internet works fine, isolating the issue to the cellular data path. A solid memory tip is to think of APN as the “address book” for data—without the right entry, your phone can still call (SMS) but can’t find the data highway.

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.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 hotspot would not prevent cellular data from working; it would share the connection.
✓
The APN settings are incorrect.
Why this is correct
APN (Access Point Name) settings are required for cellular data. If misconfigured, data will not work, but SMS and calls may still function.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Bluetooth is turned on.
Why it's wrong here
Bluetooth does not affect cellular data connectivity.
✗
The device is in roaming mode.
Why it's wrong here
Roaming mode affects data when outside the home network, but the user is likely on their home network since SMS works.

Common exam traps

Common exam trap: answer the scenario, not the keyword

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.

Detailed technical explanation

How to think about this question

The APN is a configuration string that includes the PDP (Packet Data Protocol) type (e.g., IPv4, IPv6, or IPv4v6), authentication type (PAP/CHAP), and the APN name itself (e.g., 'internet' or 'ims'). When the APN is misconfigured, the device fails to attach to the PDN (Packet Data Network) gateway, resulting in a 'no data connection' state even though the device is camped on the LTE/5G network. In real-world scenarios, users often accidentally change APN settings while troubleshooting or after a carrier profile update, and the fix is to reset APN to default or enter the correct values provided by the carrier.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 220-1201 question test?

Mobile Device Network Connectivity — This question tests Mobile Device Network Connectivity — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: 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.

What should I do if I get this 220-1201 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

1 more ways this is tested on 220-1201

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A user reports that their iPhone cannot send or receive MMS messages, but SMS works fine. They have enabled cellular data. What is the most likely missing configuration?

medium

A.The phone's iMessage is disabled.
✓ B.The MMS APN settings are incorrect or missing.
C.The phone is in Airplane Mode.
D.The recipient's phone does not support MMS.

Why B: B is correct because MMS requires a properly configured APN (Access Point Name) to establish the data connection for sending and receiving multimedia content. Since SMS works (which uses the control channel, not data), but MMS fails despite cellular data being enabled, the most likely issue is that the MMS APN settings are incorrect or missing. Without the correct APN, the device cannot route MMS traffic through the carrier's multimedia messaging center.

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