Samsung Galaxy A42 5G vs Samsung Galaxy A51
If you'd rather pay up front, the A42 5G is the cheaper buy at £130 SIM-free.
Prices updated 11 August 2026
Samsung Galaxy A42 5G
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Samsung Galaxy A51
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|---|---|---|
| Screen | 6.6" | 6.5" |
| Display | Super AMOLED | Super AMOLED |
| Resolution | 1080 x 2400 | 1080 x 2400 |
| Pixels Per Inch | 399 | 405 |
| Rear Camera | 48 Megapixels | 48 Megapixels |
| Front Camera | 20 Megapixels | 32 Megapixels |
| Chipset | Qualcomm SM7225 Snapdragon 750 5G | Exynos 9611 |
| Battery | 5,000 mAh | 4,000 mAh |
| Storage | 128GB | 64GB, 128GB |
| OS | Android 10 | Android |
| SIM Type | Standard SIM | Nano SIM |
| Connectivity | Up to 5G | Up to 4G |
| Wi-Fi | 802.11 a/b/g/n/ac | 802.11 a/b/g/n/ac |
| Bluetooth | 5.0 with A2DP, LE | 5.0 with A2DP, LE |
| Dimensions | 164.4 x 75.9 x 8.6 mm | 158.5 x 73.6 x 7.9 mm |
| Weight | 190 grams | 172 grams |
| Water Resistance | Not rated | Not rated |
| Contracts | - | - |
| SIM-free | £129.99 | £149.99 |
| Prices updated 11 August 2026 | ||
| Deals | Deals | |
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Frequently Asked Questions
Which has the better screen, the Samsung Galaxy A42 5G or Samsung Galaxy A51?
Both phones have a similar screen size at around 6.6", both screens are similarly sharp at around 399 pixels per inch, and both use Super AMOLED panels.
Which has the better camera, the Samsung Galaxy A42 5G or Samsung Galaxy A51?
The Samsung Galaxy A42 5G features a 48 Megapixels rear camera, while the Samsung Galaxy A51 has a 48 Megapixels rear camera. Both devices also have front-facing cameras for selfies and video calls.
Which is cheaper to buy SIM-free, the Samsung Galaxy A42 5G or Samsung Galaxy A51?
The Samsung Galaxy A42 5G is cheaper SIM-free, starting from £129.99.
What storage options are available for the Samsung Galaxy A42 5G and Samsung Galaxy A51?
The Samsung Galaxy A42 5G is available in 128GB, while the Samsung Galaxy A51 comes in 64GB, 128GB.
What processors do the Samsung Galaxy A42 5G and Samsung Galaxy A51 use?
The Samsung Galaxy A42 5G is powered by the Qualcomm SM7225 Snapdragon 750 5G, while the Samsung Galaxy A51 uses the Exynos 9611.
Which is easier to carry and hold, the Samsung Galaxy A42 5G or Samsung Galaxy A51?
The Samsung Galaxy A51 is the more portable of the two: it's 18g lighter at 172 grams, it's also the more compact phone at 158.5 x 73.6 x 7.9 mm, and is slimmer at 7.9mm thick.
Which is more water resistant, the Samsung Galaxy A42 5G or Samsung Galaxy A51?
Both phones share the same water resistance rating of Not rated.
What operating system do the Samsung Galaxy A42 5G and Samsung Galaxy A51 run?
The Samsung Galaxy A42 5G runs Android 10 and the Samsung Galaxy A51 runs Android. This is one of the biggest factors when choosing between the two, as each ecosystem has its own apps, services and features.