Celkon S1 vs Yezz Billy 4
Celkon S1
Yezz Billy 4
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Network
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2G networkGSM 900, 1800GSM 850, 900, 1800, 1900
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3G networkHSDPA 2100HSDPA 850, 1900
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HSDPA speedHSDPA42.2 Mbps
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HSUPA speedHSUPA5.76 Mbps
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GPRSYesYes
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EDGEYesYes
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Availability
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Oficially announced2014-22014-6
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Status2014-22014-10
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Design
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SIMDual SIMDual SIM (Micro-SIM)
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Height144 mm122.5 mm
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Width71 mm64.4 mm
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Thickness8.9 mm9.9 mm
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Weight137 g109 g
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ColorsBlackBlack, Blue, Champing Gold, Gun Metal, Red, White, Yellow
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Display
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Display typeIPS LCD capacitive touchscreenTFT capacitive touchscreen
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Physical size5.0 inches4.0 inches
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Resolution1080 x 1920 pixels480 x 800 pixels
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Pixel density441 ppi233 ppi
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Display colors1677721616777216
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Hardware
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CPUQuad-core 1.5 GHzQuad-core 1.2 GHz ARM Cortex-A7
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Chipset-Qualcomm MSM8212 Snapdragon 200
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GPU-Adreno 302
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Internal storage16 GB4 GB
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Memory RAM1 GB512 MB
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Memory cardmicroSDmicroSD
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Memory card max32 GB128 GB
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OS
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OSAndroid OS, v4.2.1 (Jelly Bean)Microsoft Windows Phone 8.1
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Main camera
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Main camera13 MP8 MP
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Primary camera resolution4160 x 3120 pixels3264 x 2448 pixels
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Primary camera videovideo720p@30fps
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Primary camera Autofocusautofocusautofocus
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Primary camera flashLED flashLED flash
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Camera features-Geo-tagging, touch focus
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Selfie camera
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Selfie camera8 MP1.3 MP
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Sound
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3.5mm jackYesYes
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LoudspeakerYesYes
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NotificationsVibration, Polyphonic, MP3 ringtonesVibration; MP3, WAV ringtones
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Multimedia
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Radio FMFM radioStereo FM radio
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Connectivity
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WLANWi-Fi 802.11b, 802.11g, 802.11nWi-Fi 802.11a, 802.11b, 802.11g, 802.11n
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WLAN WiFi HotspotYesYes
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USBmicroUSB 2.0microUSB 2.0
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BluetoothYesv4.0
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Bluetooth A2DP-Yes
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GPSYes, with A-GPSYes, with A-GPS
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GLONASS-Yes
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Features
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Messaging SMSSMS(threaded view)SMS(threaded view)
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Messaging MMSMMSMMS
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Messaging EmailEmailEmail
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Messaging IMIMIM
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Messaging Push EmailPush MailPush Email
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JavaYes, via Java MIDP emulatorNo
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Sensors-Accelerometer, proximity
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Browser
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HTMLYesHTML5
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Battery
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Battery typeLi-IonLi-Ion
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Battery capacity2300 mAh1300 mAh
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Talk time--
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Talk time 2G-7 h
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Talk time 3G-4 h 30 min
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Standby time--
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Standby time 2G-350 h
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Standby time 3G-300 h