Celkon A21
#6718
ZTE Avail
#7315Category Breakdown
Celkon A21
ZTE Avail
Performance
65.938.3
Camera
39.639.6
Display
16.033.2
Battery
15.217.4
Build
0.20.2
Connectivity
25.321.6
Audio
8.98.9
Overall
22.519.5
Summary
- The Celkon A21 features a 4.0-inch TFT display with a resolution of 320 x 480 pixels, while the ZTE Avail has a smaller 3.5-inch TFT display with the same resolution but a higher pixel density of approximately 165 ppi.
- In terms of performance, both devices are equipped with 512MB of RAM, but the A21 utilizes a quad-core 1.3 GHz Cortex-A7 CPU, whereas the Avail's specifications are unspecified.
- The camera on the ZTE Avail is superior with a 5 MP rear camera compared to the 3.15 MP rear camera of the Celkon A21, although the latter has a 1.3 MP front camera.
- The A21 has a 1500 mAh battery, while the Avail offers a slightly larger 1800 mAh battery.
- Both devices run on outdated Android versions, with the A21 on Android 4.2.2 and the Avail on Android 2.3, impacting their software experience.
Side-by-side Specification Comparison
Celkon A21
ZTE Avail
General
Release Date
2014
2011
Announced
2014
2011
Description
N/A
For AT&T
Display
Size
4"
3.5"
Type
TFT
TFT, 256K colors
Resolution
320 x 480 pixels, 3:2 ratio (~144 ppi density)
320 x 480 pixels, 3:2 ratio (~165 ppi density)
PPI
320
320
Refresh Rate
60Hz
60Hz
HDR Support
✗
✗
Protection
N/A
N/A
Performance
Chipset
Mediatek MT6582 (28 nm)
N/A
CPU
Quad-core 1.3 GHz Cortex-A7
N/A
GPU
Mali-400MP2
N/A
Memory
512MB 256MB RAM
512MB 512MB RAM
Expandable Storage
✗
✗
Card Slot
microSDHC
microSDHC (dedicated slot)
Camera
Main Camera
3.15 MP
5 MP, AF
Main Camera Features
N/A
N/A
Front Camera
1.3 MP
N/A
Front Camera Features
N/A
N/A
Video Recording
Yes
Yes
Selfie Video
N/A
N/A
Optical Stabilization
✗
✗
Night Mode
✗
✗
Raw Photo Support
✗
✗
Battery
Capacity
1500 mAh
1800 mAh
Battery Details
Li-Ion 1500 mAh battery
Removable Li-Ion 1800 mAh battery
Charging Details
N/A
N/A
Fast Charging
✗
✗
Wireless Charging
✗
✗
Build & Safety
Dimensions
124.8 x 66.1 x 10.8 mm (4.91 x 2.60 x 0.43 in)
116 x 62 x 13 mm (4.57 x 2.44 x 0.51 in)
Weight
115.3 g
127 g
Materials
N/A
N/A
Colors
Black, Blue, Red
Black
Foldable
✗
✗
SAR
N/A
N/A
Connectivity
SIM
Dual SIM (Dual stand-by)
Mini-SIM
Network
GSM / HSPA
GSM / HSPA
Network Speed
HSPA
HSPA 7.2/2 Mbps
5G
✗
✗
4G
✗
✗
WiFi
Wi-Fi 802.11 b/g/n
Wi-Fi 802.11 b/g, hotspot
Bluetooth
4.0, A2DP
2.0, A2DP
NFC
✗
✗
USB
microUSB
microUSB 2.0
IR Blaster
✗
✗
Headphone Jack
✓
✓
Radio
✗
✗
Positioning
No
GPS
Audio
Stereo Speakers
✗
✗
Loudspeaker
Yes
Yes
Audio Jack
Yes
Yes
Software & Security
Operating System
Android 4.2.2 (Jelly Bean)
Android 2.3 (Gingerbread)
Fingerprint
✗
✗
Face Unlock
✗
✗
Sensors
Accelerometer
Accelerometer, proximity, compass