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Galaxy A20s vs Realme P3x: 5G, Battery & More

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This guide compares the Samsung Galaxy A20s and the Realme P3x across 5G support, battery life, performance, cameras, and software. You will learn which phone fits your needs based on specs that matter most for daily use, and what to check before buying either model.

What You’ll Need

  • Access to the official spec pages for both phones (Samsung and Realme websites).
  • A note-taking app or paper to jot down comparisons.
  • Your own usage priorities (gaming, camera, battery, or budget).

Step-by-Step

  1. Check 5G support first. The Galaxy A20s (launched 2019) is a 4G-only phone. The Realme P3x (2025) supports 5G. If you need 5G, the A20s is automatically out. Look up the exact 5G bands for the P3x to confirm they match your carrier.
  2. Compare battery capacity. The A20s has a 4000 mAh battery. The Realme P3x has a much larger 6000 mAh battery. For heavy usage, the P3x will last significantly longer on a single charge.
  3. Check charging speeds. The A20s supports 15W charging. The P3x supports 45W fast charging. This means the P3x charges from 0 to 100% in about half the time. Verify the charger included in the box—some regions ship a lower wattage adapter.
  4. Compare processors and RAM. The A20s uses a Snapdragon 450 with up to 4GB RAM. The P3x uses a newer Dimensity 6400 with up to 8GB RAM. For gaming or multitasking, the P3x is far more capable. The A20s is fine for basic calls, messaging, and light browsing.
  5. Look at screen quality. The A20s has a 6.5-inch HD+ (720p) TFT LCD at 60Hz. The P3x has a 6.67-inch FHD+ (1080p) AMOLED at 120Hz. The P3x offers sharper text, better colors, and smoother scrolling. If you watch videos or read a lot, this difference is noticeable.
  6. Compare camera setups. The A20s has a triple camera (13MP main, 5MP ultrawide, 2MP depth). The P3x has a dual camera (50MP main, 2MP depth). The P3x’s main sensor captures more detail and performs better in low light. The A20s has an ultrawide lens, which the P3x lacks—if ultrawide shots are essential, that’s a point for the older phone.
  7. Check software support. The A20s is stuck on Android 10 (with One UI 2.0) and no longer receives security updates. The P3x ships with Android 15 and Realme promises two years of OS updates and three years of security patches. For safety and app compatibility, the P3x is the clear winner.
  8. Compare build and ports. Both have a headphone jack and microSD slot. The P3x has a side-mounted fingerprint sensor; the A20s has a rear-mounted one. The P3x also has a USB-C port (the A20s uses micro-USB). This matters for cable compatibility.
  9. Check dimensions and weight. The A20s is lighter (183g) and thinner (8.3mm). The P3x is heavier (around 188g) and thicker (8.4mm) due to the larger battery. If you prefer a lighter phone, the A20s is more comfortable, but the P3x is still manageable.
  10. Decide based on your budget and needs. If you need 5G, long battery life, fast charging, and a better screen, the Realme P3x is the only logical choice. If you already own an A20s and only use it for basic tasks, it still works, but it’s not worth buying new in 2025.

Common Mistakes

  • Assuming the A20s can be upgraded to 5G: No software update or SIM change can add 5G hardware. The modem simply doesn’t support it.
  • Ignoring regional variants: The Realme P3x may have different RAM/storage configurations depending on where you buy it. Always check the exact model number.
  • Comparing camera megapixels only: A 50MP sensor doesn’t automatically take better photos than a 13MP one. The P3x’s larger sensor and newer processing make a real difference, but the A20s’s ultrawide lens is a feature the P3x lacks.
  • Forgetting about software updates: The A20s is no longer updated, which means security vulnerabilities remain unfixed. This is a serious issue for banking apps or personal data.

Tips

  • If you’re on a tight budget and don’t need 5G, consider a used A20s for basic calls and texting—but avoid using it for sensitive tasks because of missing security patches.
  • For the Realme P3x, enable the 120Hz refresh rate in display settings to get the full smooth experience, but know that it drains battery faster.
  • Use battery saver mode on the P3x to extend the 6000 mAh battery to two full days of moderate use.
  • When comparing prices, factor in the cost of a charger and cable—the A20s uses micro-USB, which is outdated and harder to find.

Troubleshooting

  • If the Realme P3x doesn’t get 5G on your network: Check that your SIM card is 5G-enabled and that you’ve enabled 5G in the network settings. Also, confirm that your carrier’s 5G band matches the P3x’s supported bands (e.g., n1, n3, n5, n8, n28, n40, n41, n78).
  • If the A20s is laggy after an update: Perform a factory reset (backup data first). This clears cache and old app data that may be causing slowdowns.
  • If the P3x battery drains too fast: Check for apps running in the background. Go to Settings > Battery > Battery Usage to see which apps are consuming power. Also, reduce screen brightness and turn off 5G if you don’t need it.
  • If you can’t find the A20s’s original charger: Any micro-USB charger works, but avoid high-wattage chargers (above 15W) as they may not be supported and could damage the battery over time.

Frequently Asked Questions

Does the Galaxy A20s support 5G?

No, the Galaxy A20s is a 4G LTE phone. It lacks the necessary modem hardware for 5G.

Which phone has a better battery?

The Realme P3x has a 6000 mAh battery compared to the A20s’s 4000 mAh. The P3x also charges faster (45W vs 15W), making it the clear winner in battery endurance and refill speed.

Can I use the A20s as a daily driver in 2025?

Technically yes, but it’s not recommended. The phone is slow, lacks 5G, and no longer receives security updates, leaving you vulnerable to malware and privacy risks.

Does the Realme P3x have a headphone jack?

Yes, the Realme P3x retains a 3.5mm headphone jack, just like the A20s.

Which phone is better for gaming?

The Realme P3x is far better. Its Dimensity 6400 chipset and 120Hz screen provide smoother gameplay. The A20s’s old Snapdragon 450 struggles with even basic games like PUBG Mobile at low settings.

Is the Realme P3x worth upgrading from the A20s?

Yes, if you want 5G, a better screen, faster charging, and longer battery life. The upgrade is substantial in every key area except the ultrawide camera, which the A20s has and the P3x lacks.

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