Infinix Smart 20 Specs, Price, Camera, Battery & Best Review (2026)

Q: What display type does the Infinix Smart 20 use, and how bright is its screen?

The Infinix Smart 20 has a 6.78-inch IPS LCD with HD+ resolution (720 x 1576) and a 120Hz refresh rate. Peak brightness is about 700 nits, so it can look dim in strong sunlight. The 120Hz rate is rare in this price range and makes scrolling feel smooth.

Q: Which processor is used in the Infinix Smart 20?

The Infinix Smart 20 runs on the MediaTek Helio G81 Ultimate, a 12nm octa-core chip with two 2.0GHz Cortex-A75 cores, six Cortex-A55 cores and a Mali-G52 MP2 GPU. It’s 4G only, with no 5G. It handles daily apps, multitasking and casual games well, but it isn’t built for heavy gaming.

Q: What RAM and storage options does the Infinix Smart 20 offer?

It comes with 4GB LPDDR4X RAM and 64GB or 128GB storage (eMMC 5.1). There’s a dedicated microSD slot to expand storage, so you can keep two SIM cards and a memory card together.

Q: How many megapixels are the main and front cameras of the Infinix Smart 20?

The Infinix Smart 20 has an 8MP rear camera with autofocus and LED flash, and an 8MP front camera in a punch-hole. The phone records 2K (1440p) video at 30fps, which is rare for a budget phone. Expect decent daylight photos and basic low-light results.

Q: What are the battery capacity and charging speed of the Infinix Smart 20?

The Infinix Smart 20 has a 5200mAh battery with 15W wired charging and 5W reverse wired charging. 91mobiles measured about 11 hours in its PCMark battery test, enough for a full day of normal use. Charging from 20% to 100% takes about 2 hours 12 minutes, so it charges slowly

✪ Infinix Smart 20 ✪

Last Time Update : 26 October, 2026

United States

$140 USD

…

Pakistan (PKR)

46,000 PKR

India (INR)

₹14,000 INR

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✪ Infinix Smart 20 ✪

Quick Specs

Display: 6.78 inchIPS LCD120 Hz
Processor: MediaTek Helio G812.0 GHz
RAM & Storage: 4 + 128 GB
Rear Camera: 8 MP
Front Camera: 8 MP
Battery & Charging: 5200 mAH15 W

Full Specification

IMPORTANT INFORMATION

Specifications Disclaimer

NOTICE

Specifications are collected from official manufacturers and trusted sources. Actual details may vary by region, model variant, or software updates. We strive for accuracy but cannot guarantee error-free information.

BASIC INFO

Mobile

Infinix Smart 20

Model

X6840, X6840B

Series

Smart Series

Verify Mobile Specifications

Official information & trusted references

Official Manufacturer WebsiteExplore the original product information (opens in a new tab)

Trusted Specification Sources

Cross-reference · 5 sources

Links open third-party websites. The Purple ticks are a design marker only; they do not mean a source has verified these specifications or endorses FSL-Specs.

Last Time Update : 26 October, 2026

Highlights & Review Of Infinix Smart 20

Display Highlights

The Infinix Smart 20 has the lowest-resolution screen in this group: a 6.78-inch IPS LCD at 720 x 1576 (about 256 ppi) with a 120Hz refresh rate and 700 nits (HBM) brightness, listed at PKR 46,000 new from retailers. The Infinix Zero 40 4G uses a 6.78-inch AMOLED at 1080 x 2436 (393 ppi) with 1300 nits (HBM). That is about 2.3 times the pixel count and 600 nits more brightness than the Infinix Smart 20, for only PKR 2,000 more at PKR 48,000 used.

The ZTE Nubia Neo 2 is the cheapest option here at PKR 40,000 used, which is PKR 6,000 below the Infinix Smart 20. Its 6.72-inch IPS LCD runs 1080 x 2400 (392 ppi) at 120Hz, so it is far sharper than the Smart 20 on the same panel technology. No brightness figure is published for it, so outdoor visibility can’t be compared and should be treated as unknown, not assumed equal.

The ZTE Nubia V80 Pro is the closest match to the Infinix Smart 20 on panel type. Its 6.75-inch IPS LCD at 900 x 1940 (317 ppi), 120Hz and 1000 nits (HBM) costs PKR 48,000 new. That is PKR 2,000 more than the Smart 20 for a sharper screen and 300 nits more brightness.

All four phones run 120Hz, so refresh rate separates none of them. Panel type and resolution do: the Zero 40 4G is the only AMOLED, and the Infinix Smart 20 is the only panel under 900 pixels wide and the dimmest of the three with a confirmed brightness figure.

Phone	Panel	Size		Refresh rate	Brightness
Infinix Smart 20	IPS LCD	6.78-inch	720 x 1576	120Hz	700 nits (HBM)
ZTE Nubia Neo 2	IPS LCD	6.72-inch	1080 x 2400	120Hz	Not published
ZTE Nubia V80 Pro	IPS LCD	6.75-inch	900 x 1940	120Hz	1000 nits (HBM)
Infinix Zero 40 4G	AMOLED	6.78-inch	1080 x 2436	120Hz	1300 nits (HBM)

Verdict: The Infinix Smart 20 has the weakest display of the four at PKR 46,000, trailing the used Nubia Neo 2 on sharpness while costing PKR 6,000 more, and trailing the new Nubia V80 Pro on both sharpness and brightness. Buyers who care about screen quality should look at the Zero 40 4G’s AMOLED for PKR 2,000 more.

Performance Highlights

The Infinix Smart 20 posts the lowest score in this group at 360,000 AnTuTu (v11) on its 12nm MediaTek Helio G81. The ZTE Nubia Neo 2 reaches 760,000 AnTuTu (v11) on its 6nm Unisoc T820, about 2.1 times the Smart 20’s score, while costing PKR 6,000 less at PKR 40,000 used. All prices are retailer listings. All four phones have a v11 result, so v11 is the fair common benchmark here.

The Nubia Neo 2’s lead goes beyond the score. Its Unisoc T820 has four Cortex-A76 cores, including one clocked at 2.7GHz, and it is the only chipset in this group on a 5G-capable phone. The other three phones are 4G only. The Infinix Zero 40 4G sits second at 570,000 AnTuTu (v11) on the Helio G100, which is 33% below the Neo 2 and 58% above the Infinix Smart 20, at PKR 48,000 used.

The ZTE Nubia V80 Pro scores 450,000 AnTuTu (v11) on the Unisoc T620, 25% above the Infinix Smart 20 for PKR 2,000 more at PKR 48,000 new. Its Mali-G57 MP1 has a single GPU cluster, and the Smart 20 uses the Mali-G52 MC2. Where v10 scores exist, they give the same order: 450,000 for the Neo 2, 300,000 for the V80 Pro and 260,000 for the Smart 20. The Zero 40 4G has no v10 score listed, so v10 can’t rank all four.

Phone	Chipset	Process	CPU cores	GPU	AnTuTu v11
Infinix Smart 20	MediaTek Helio G81	12nm	2 x Cortex-A75 + 6 x Cortex-A55	Mali-G52 MC2	360,000
ZTE Nubia Neo 2	Unisoc T820	6nm	4 x Cortex-A76 + 4 x Cortex-A55	Mali-G57	760,000
ZTE Nubia V80 Pro	Unisoc T620	12nm	2 x Cortex-A75 + 6 x Cortex-A55	Mali-G57 MP1	450,000
Infinix Zero 40 4G	MediaTek Helio G100	6nm	2 x Cortex-A76 + 6 x Cortex-A55	Mali-G57 MC2	570,000

Verdict: The Infinix Smart 20 has the weakest processor of the four at PKR 46,000, delivering less than half the Nubia Neo 2’s 760,000 AnTuTu (v11) while costing PKR 6,000 more, so performance-focused buyers should choose the Neo 2 or the Zero 40 4G instead.

Memory & Storage Highlights

The Infinix Smart 20 in the 4GB + 128GB variant has half the RAM and half the storage of the other three phones, at PKR 46,000 new from retailers. Its memory is LPDDR4X RAM with eMMC 5.1 storage, and it keeps a microSD slot.

The ZTE Nubia Neo 2 offers 8GB LPDDR4X RAM and 256GB of UFS 3.1 storage for PKR 40,000 used, so it doubles both capacities and uses the fastest storage standard in this group while costing PKR 6,000 less. That works out to roughly PKR 359 per GB of storage for the Smart 20 against PKR 156 for the Neo 2.

All four phones use LPDDR4X RAM, so RAM type decides nothing here. RAM capacity and storage type do. The storage standards rank UFS 3.1 first, UFS 2.2 second and eMMC 5.1 third. That puts the Infinix Zero 40 4G, with 8GB RAM and 256GB of UFS 2.2 at PKR 48,000 used, ahead of the ZTE Nubia V80 Pro. The V80 Pro has the same 8GB and 256GB at the same PKR 48,000 (new) but slower eMMC 5.1 storage.

Expandability splits the group differently. Only the Infinix Smart 20 and the Nubia V80 Pro have a microSD slot. The Nubia Neo 2 and Zero 40 4G are fixed at 256GB, which matters for anyone who expects to fill it.

Phone	RAM	RAM type	Storage	Storage (ROM) type	microSD
Infinix Smart 20	4GB	LPDDR4X	128GB	eMMC 5.1	Yes
ZTE Nubia Neo 2	8GB	LPDDR4X	256GB	UFS 3.1	No
ZTE Nubia V80 Pro	8GB	LPDDR4X	256GB	eMMC 5.1	Yes
Infinix Zero 40 4G	8GB	LPDDR4X	256GB	UFS 2.2	No

Verdict: The Infinix Smart 20 has the weakest memory setup of the four, with the least RAM, the least storage and the same slower eMMC 5.1 standard as the Nubia V80 Pro. Its microSD slot is its one advantage over the Nubia Neo 2, which is the stronger buy at PKR 40,000.

Camera Highlights

The Infinix Smart 20 has a single 8MP rear camera and an 8MP front camera, with no sensor brand disclosed for either, at PKR 46,000 new from retailers.

The Infinix Zero 40 4G has a triple rear setup led by a 108MP Samsung HM6 main sensor, plus a 50MP and a 2MP lens. Its 50MP front camera has over six times the resolution of the Smart 20’s selfie camera, at PKR 48,000 used.

The ZTE Nubia Neo 2 has a 50MP main camera that reviewers identify as a Samsung S5KJN1, a 2MP secondary lens and a 16MP front camera, at PKR 40,000 used, the lowest price in this group. Its front camera has no flash, and video stops at 1080p@30fps on both cameras.

Sources differ on the ZTE Nubia V80 Pro’s rear resolution: one listing gives 50MP, while another gives 108MP; this hasn’t been independently confirmed. Its 16MP front camera and 1080p@30fps video on both cameras are consistent across listings, and no stabilization is listed, at PKR 48,000 new.

Video separates the group more than megapixels do. The Infinix Smart 20 and the Zero 40 4G are the only phones that record 2K (1440p) at 30fps on both rear and front cameras, which is the Smart 20’s best camera spec.

Phone	Rear camera	Main sensor	Front camera	Rear video	Front video
Infinix Smart 20	8MP	Not disclosed	8MP	2K@30, 1080p@30	2K@30, 1080p@30/60
ZTE Nubia Neo 2	50MP + 2MP	Samsung S5KJN1 (reviewer-identified)	16MP	1080p@30	1080p@30
ZTE Nubia V80 Pro	50MP (another listing says 108MP)	Not disclosed	16MP	1080p@30	1080p@30
Infinix Zero 40 4G	108MP + 50MP + 2MP	Samsung HM6 (108MP)	50MP	1440p@30, 1080p@30/60	1440p@30, 1080p@30/60

Verdict: The Infinix Smart 20 has the weakest camera hardware of the four at PKR 46,000, with the lowest rear and front resolution and no disclosed sensor. Its 2K@30fps video is its only edge, while the Infinix Zero 40 4G is the stronger camera phone for PKR 2,000 more.

Battery & Charging Highlights

The Infinix Smart 20 carries a 5200mAh battery but charges at only 15W, the slowest wired speed in this group, at PKR 46,000 new from retailers. The Infinix Zero 40 4G charges at 45W, three times the Smart 20’s wattage, on a slightly smaller 5000mAh cell, at PKR 48,000 used. That makes the Zero 40 4G the faster phone to refill, while the Smart 20 keeps the larger battery of the two.

The ZTE Nubia Neo 2 has the largest battery, 6000mAh, which is 15% more than the Infinix Smart 20, and charges at 33W, about 2.2 times the Smart 20’s speed. It costs PKR 40,000 used, PKR 6,000 less. Its page also mentions a regional 5200mAh variant, and which one the Pakistani unit ships with isn’t confirmed. No reverse charging is listed for it.

The ZTE Nubia V80 Pro matches the Zero 40 4G on 5000mAh and 10W reverse wired charging, but its 22.5W wired speed sits between the Smart 20 and the Zero 40 4G, at PKR 48,000 new. The Infinix Smart 20’s 5200mAh is within 5% of the 5000mAh cells, so capacity separates only the Neo 2. No wireless charging is listed for any of the four phones, and the Smart 20’s 5W reverse charging is the lowest of the three phones that list reverse charging.

Phone	Battery	Wired charging
Infinix Smart 20	5200mAh	15W
ZTE Nubia Neo 2	6000mAh	33W
ZTE Nubia V80 Pro	5000mAh	22.5W
Infinix Zero 40 4G	5000mAh	45W

Verdict: The ZTE Nubia Neo 2 has the best battery package of the four, with the largest cell and 33W charging at PKR 40,000. The Infinix Smart 20 matches the 5000mAh phones on capacity but has the slowest wired charging, so buyers who want quick top-ups should look at the Zero 40 4G’s 45W.

Final Verdict

On a balanced weighting across display, performance, memory, camera and battery, the Infinix Zero 40 4G is the strongest overall phone in this group at PKR 48,000 (used). It leads on display with the only AMOLED panel, 1300 nits (HBM), and has the best camera, and it comes second on performance and battery.

The ZTE Nubia Neo 2 is a close second overall and the best value, at PKR 40,000 (used). Its 760,000 AnTuTu (v11) score, 8GB RAM, UFS 3.1 storage and 6000mAh battery beat the Zero 40 4G on four specs for PKR 8,000 less, but its camera and display trail.

The ZTE Nubia V80 Pro lands third at PKR 48,000 (new), and the Infinix Smart 20 finishes last at PKR 46,000 (new). It trails on display, performance, memory, camera and battery, and only its microSD slot and 2K video stand out. Both leaders are used listings, so condition can’t be judged from specs.

Bottom line: The Infinix Zero 40 4G is the best all-round phone here, the Nubia Neo 2 is the smarter buy for the money, and the Infinix Smart 20 is the weakest choice at PKR 46,000.

Ranking:

Infinix Zero 40 4G – PKR 48,000 (used)
ZTE Nubia Neo 2 – PKR 40,000 (used)
ZTE Nubia V80 Pro – PKR 48,000 (new)
Infinix Smart 20 – PKR 46,000 (new)