Asus Google Nexus 7 Cellular vs Celkon A21
Asus Google Nexus 7 Cellular
Celkon A21
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Network
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2G networkGSM 850, 900, 1800, 1900GSM 900, 1800
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3G networkHSDPA 850, 900, 1700, 1900, 2100HSDPA 2100
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HSDPA speedHSDPA, 21 MbpsHSDPA
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HSUPA speedHSUPA, 5.76 Mbps-
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GPRSYesYes
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EDGEYesYes
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Availability
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Status2012-112014-12
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Oficially announced2012-102014-12
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Design
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SIMMicro-SIMDual SIM (dual stand-by)
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Height198.5 mm124.8 mm
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Width120 mm66.1 mm
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Thickness10.5 mm10.8 mm
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Weight347 g115.3 g
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ColorsBlackBlack, Blue, Red
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Display
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Display typeLED-backlit IPS LCD capacitive touchscreenCapacitive touchscreen
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Physical size7.0 inches4.0 inches
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Resolution800 x 1280 pixels320 x 480 pixels
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Pixel density216 ppi144 ppi
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Display colors16777216-
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Hardware
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CPUQuad-core 1.2 GHz ARM Cortex-A9Dual-core 1.2 GHz
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ChipsetNvidia Tegra 3Mediatek MT6582
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GPUULP GeForce-
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Memory ROM-512 MB
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Memory RAM1 GB256 MB
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Internal storage16, 32 GB-
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Memory cardmicroSD
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Memory card max-32 GB
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OS
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OSAndroid OS, v4.1 (Jelly Bean)Android OS, v4.2.2 (Jelly Bean)
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Main camera
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Main camera1.2 MP3.15 MP
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Primary camera resolution1280 x 960 pixels-
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Primary camera video720pvideo
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Selfie camera
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Secondary cameraNo-
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Selfie camera1.3 MP
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Sound
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3.5mm jackYesYes
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LoudspeakerYes, with stereo speakersYes
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NotificationsN/AVibration, Polyphonic, MP3 ringtones
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Multimedia
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RadioNo-
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Radio FM-FM radio
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Connectivity
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WLANWi-Fi 802.11b, 802.11g, 802.11nWi-Fi
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WLAN WiFi HotspotYes-
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USBmicroUSB 2.0Yes
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Bluetoothv3.0v4.0
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GPSYesNo
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Features
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Messaging SMS-SMS(threaded view)
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Messaging MMS-MMS
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Messaging EmailEmailEmail
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Messaging IMIM-
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Messaging Push EmailPush Email-
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JavaNoYes, via Java MIDP emulator
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Browser
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HTMLYesYes
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Battery
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Battery typeLi-IonLi-Ion
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Battery capacity4325 mAh1500 mAh
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Battery removableNon-removable-
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Talk time9 h-
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Talk time 3G-8 h
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Standby time300 h-
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Standby time 3G-120 h