- A
The screen protector is incompatible with the phone model.
Why wrong: While incompatibility can cause fit issues, bubbles and lifting edges are more commonly due to installation errors rather than the protector being the wrong size.
- B
The phone's screen has a manufacturing defect.
Why wrong: A screen defect could cause display issues, but it would not cause a screen protector to bubble or lift after installation.
- C
The user did not properly clean the screen before installation.
Dust, oil, or moisture left on the screen prevents the adhesive from bonding evenly, leading to bubbles and lifting edges. This is the most common cause of such issues.
- D
The screen protector is a tempered glass type, which is prone to bubbles.
Why wrong: Tempered glass protectors are actually less prone to bubbles than plastic ones when installed correctly. The issue is not inherent to the material.
Why Does My Screen Protector Have Bubbles and Lifting Edges?
This 220-1201 practice question tests your understanding of mobile device accessories. 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 reports that their smartphone's screen protector has a large bubble in the center and the edges are lifting. They installed it themselves two days ago. What is the most likely cause of this issue?
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.
Quick Answer
The answer is improper installation, specifically failing to clean the screen thoroughly before applying the protector. This is the most likely cause because even microscopic dust, oil, or residue creates gaps between the glass and the adhesive layer, preventing a perfect seal. As the adhesive cures over the first 48 hours, trapped particles cause central bubbles, while edge lifting occurs when the adhesive cannot bond to a contaminated surface. On the CompTIA A+ Core 1 220-1201 exam, this question tests your understanding of mobile device maintenance and common user errors—a frequent trap is blaming the protector’s quality rather than the installation process. Remember the memory tip: “Clean before you seal” to avoid bubbles that reveal.
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 user did not properly clean the screen before installation.
Screen protector bubbles and lifting edges are almost always caused by improper installation, such as not cleaning the screen thoroughly or not aligning the protector correctly. Even high-quality protectors will fail if the surface isn't perfectly clean and dust-free. The correct answer is improper installation.
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 screen protector is incompatible with the phone model.
Why it's wrong here
While incompatibility can cause fit issues, bubbles and lifting edges are more commonly due to installation errors rather than the protector being the wrong size.
- ✗
The phone's screen has a manufacturing defect.
Why it's wrong here
A screen defect could cause display issues, but it would not cause a screen protector to bubble or lift after installation.
- ✓
The user did not properly clean the screen before installation.
Why this is correct
Dust, oil, or moisture left on the screen prevents the adhesive from bonding evenly, leading to bubbles and lifting edges. This is the most common cause of such issues.
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.
- ✗
The screen protector is a tempered glass type, which is prone to bubbles.
Why it's wrong here
Tempered glass protectors are actually less prone to bubbles than plastic ones when installed correctly. The issue is not inherent to the material.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Mobile Device Accessories — study guide chapter
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Mobile Device Accessories — This question tests Mobile Device Accessories — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The user did not properly clean the screen before installation. — Screen protector bubbles and lifting edges are almost always caused by improper installation, such as not cleaning the screen thoroughly or not aligning the protector correctly. Even high-quality protectors will fail if the surface isn't perfectly clean and dust-free. The correct answer is improper installation.
What should I do if I get this 220-1201 question wrong?
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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.
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Last reviewed: Jun 18, 2026
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.
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