Phone Comparison - Samsung I9100 Galaxy S II vs Samsung Galaxy Alpha (S801) vs Xiaomi Mi 4i

general General Info

Manufacturer Samsung Samsung Xiaomi
Announced February 2011 August 2014 April 2015
Status Available - April 2011 Available - September 2014 Available - April 2015
Price - - Rs. 8,999 ($132.34) [Similarly Priced]
Colors Black, White, Pink Charcoal Black, Sleek Silver, Dazzling White, Frosted Gold, Scub Black, White, Blue, Yellow, Pink
Form Factor Candybar Candybar Candybar
Dimension 125.3 x 66.1 x 8.5 mm
(4.93 x 2.6 x 0.33 in)
132.4 x 65.5 x 6.7 mm
(5.21 x 2.58 x 0.26 in)
138.1 x 69.6 x 7.8 mm
(5.44 x 2.74 x 0.31 in)
Weight 116 g (4.09 oz) 115 g (4.06 oz) 130 g (4.59 oz)
2G Network GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G Network HSDPA 850 / 900 / 1900 / 2100 HSDPA HSDPA 850 / 900 / 1900 / 2100
4G Network - LTE LTE
Messaging SMS, MMS, IM SMS, MMS, EMail, IM SMS, MMS, EMail, IM

hardware Hardware and OS

OS Android OS, v2.3 (Gingerbread), planned upgrade to v4.0 Android OS, v4.4.4 (KitKat) Android OS, v5.0 (Lollipop)
Processor Dual-core 1.2GHz ARM Cortex-A9 processor, Exynos chipset Quad-core 2.5 GHz Krait 400, Qualcomm MSM8974AC Snapdragon 801 Quad-core 1.7 GHz Cortex-A53 & quad-core 1.0 GHz Cortex-A53, Qualcomm MSM8939 Snapdragon 615
GPU Mali-400MP Adreno 330 Adreno 405
RAM 1 GB 2 GB 2 GB
Internal Memory 16 GB/32 GB storage 32 GB 16/32 GB
External Memory microSD, up to 32GB, 8 GB included No No

display Display

Type Super AMOLED Plus capacitive touchscreen Super AMOLED capacitive touchscreen IPS LCD capacitive touchscreen
Colors 16M colors 16M colors 16M colors
Size 4.3 inches 4.7 inches 5.0 inches
Resolution 480 x 800 pixels (217 ppi) 720 x 1280 pixels (312 ppi) 1080 x 1920 pixels (441 ppi)
Screen-to-Body Ratio 63.52% 70.43% 71.57%
Multi-Touch yes yes yes

multimedia Multimedia

3.5mm Jack yes yes yes
Radio Stereo FM radio with RDS No FM radio
Games Yes + Downloadable Yes + Downloadable Yes + Downloadable
Loud Speaker yes yes yes

camera Camera

Rear Camera 8 MP, 3264x2448 pixels 12 MP, 4128 x 3096 pixels 13 MP, 4128 x 3096 pixels
Flash LED flash LED flash LED flash
Features Auto focus, Geo-tagging, Touch Focus, Face And Smile Detection, Image Stabilization Auto focus, Dual Camera, Geo-tagging, Touch Focus, Face And Smile Detection, Panorama, HDR Auto focus, Geo-tagging, Touch Focus, Face/smile Detection, Panorama, HDR
Video Yes, 1080p@30fps 2160p@30fps, 1080p@60fps, 720p@120fps 1080p@30fps
Front Camera Yes, 2 MP [Similar] 2.1 MP [Similar] 5 MP [Similar]

connectivity Connectivity and Data Rate

GPRS Class 12 (4+1/3+2/2+3/1+4 slots), 32 - 48 kbps Yes Yes
Edge Class 12 Yes Yes
3G HSDPA, 21 Mbps; HSUPA, 5.76 Mbps HSDPA, 42 Mbps, HSUPA; LTE-A, Cat6, 300 Mbps DL, 50 Mbps UL HSPA, LTE
Bluetooth Yes, v3.0+HS v4.0, A2DP, EDR, LE v4.0, A2DP
Wi-Fi Wi-Fi 802.11 a/b/g/n, DLNA, Wi-Fi Direct, Wi-Fi hotspot Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, Wi-Fi hotspot Wi-Fi 802.11 a/b/g/n, dual-band, hotspot
USB Yes, v2.0 microUSB (MHL), USB On-the-go microUSB v2.0 microUSB v2.0
GPS Yes, with A-GPS support Yes, with A-GPS, GLONASS, Beidou Yes, with A-GPS, GLONASS
Browser HTML HTML5 HTML5

memory User Memory

Internal 16GB/32GB storage, 1 GB RAM 32 GB, 2 GB RAM 16/32 GB, 2 GB RAM
Expandable Storage microSD, up to 32GB, 8 GB included No No
USB OTG Supported - -

Apps Sensors

Fingerprint fingerprint not supported fingerprint not supported fingerprint not supported
Proximity Sensor proximity sensor present proximity sensor present proximity sensor present
Accelerometer Sensor accelerometer sensor present accelerometer sensor present accelerometer sensor present
NFC NFC supported NFC supported NFC not supported

battery Battery

Type Standard battery, Li-Ion Li-Ion Battery Li-Po Battery
Capacity 1650 mAh 1860 mAh 3120 mAh
Stand by Up to 710 h (2G)
Up to 610 h (3G)
- -
Talk Time Up to 18 h 20 min (2G)
Up to 8 h 40 min (3G)
- -