#1

What makes Karbonn Smart A2 Plus better Choice

Screen Size 3.5 inches 4 inches (Screen to Body Ratio: 55.93%) 4 inches (Screen to Body Ratio: 55.93%)
Karbonn A2 Plus,Karbonn A2 has 14.29% bigger screen size.
GPS No Yes, with A-GPS support No
Karbonn A2 Plus has GPS, whereas Zen Ultraphone 304,Karbonn A2 doesn't.
Display Clarity 165 ppi 233 ppi 233 ppi
Karbonn A2 Plus,Karbonn A2 has 41.21% higher screen resolution than Zen Ultraphone 304.
#2

What makes Zen Ultraphone 304 better Choice

Primary Camera Resolution 3.2 MP 3.15 MP 3.15 MP
Zen Ultraphone 304 has 1.59% higher primary camera resolution.
Secondary Camera Resolution 1.3 MP 0.3 MP 0.3 MP
Zen Ultraphone 304 has 333.33% higher front camera resolution.
Internal Storage 512 MB 180 MB 200 MB
Zen Ultraphone 304 has 184.44% more internal memory.
Zen Ultraphone 304
Zen Ultraphone 304

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#3

What makes Karbonn A2 better Choice

Screen Size 3.5 inches 4 inches (Screen to Body Ratio: 55.93%) 4 inches (Screen to Body Ratio: 55.93%)
Karbonn A2 Plus,Karbonn A2 has 14.29% bigger screen size.
Display Clarity 165 ppi 233 ppi 233 ppi
Karbonn A2 Plus,Karbonn A2 has 41.21% higher screen resolution than Zen Ultraphone 304.

Feature Comparison of Zen Ultraphone 304 Vs Karbonn A2 Plus Vs Karbonn A2

General
Sim Support Dual Sim, Mini-SIM, GSM + GSM Dual Sim, Mini-SIM, GSM + GSM Dual Sim, Mini-SIM, GSM + GSM
Keypad Touch Touch Touch
Phone Dimensions 124 x 63.6 x 12.4 mm 124 x 63.6 x 12.4 mm
Phone Weight 110 grams 110 grams
SAR Value 0.63 W/kg
Display
Screen Size 3.5 inches 4 inches (Screen to Body Ratio: 55.93%) 4 inches (Screen to Body Ratio: 55.93%)
Screen Resolution 320 x 480 Pixels, 165 ppi 480 x 800 Pixels, 233 ppi 480 x 800 Pixels, 233 ppi
Screen Type TFT, With 16 M Colors TFT, With 16 M Colors TFT, With 16 M Colors
Touch Type Capacitive With Multitouch Capacitive With Multitouch up to 5 fingers Capacitive With Multitouch up to 5 fingers
Photo & Video
Camera Yes, 3.2 Megapixel Yes, 3.15 Megapixel Yes, 3.15 Megapixel
Flash No No
Front Camera Yes, 1.3 Megapixel Yes, 0.3 Megapixel Yes, 0.3 Megapixel
Camera Features Video recorder, Video player
Video Recording Yes Yes Yes
Technical
Operating System Android 2.3 - Gingerbread Android 4.0 - Ice Cream Sandwich Android 2.3.6 - Gingerbread
Processor 1 GHz , Single Core 1 GHz , Single Core 1 GHz , Single Core
RAM 256 MB 256 MB 256 MB
User Interface Modified Android Modified Android Modified Android
Battery
Battery 1400 mAh, Li-ion 1750 mAh, Li-ion 1750 mAh, Li-ion
Battery Standby Up to 120 hrs Up to 120 hrs
Battery Talk Time Up to 3.5 hrs Up to 3 hrs 30 min
Connectivity
GPRS Yes Yes Yes
EDGE Yes Yes Yes
3G No No No
4G No No
Wi-Fi Yes Yes, with Tethering Yes, with Tethering
WiMax No
USB Connectivity Yes, microUSB v2.0 Yes, microUSB v2.0 Yes, v2.0
GPS No Yes, with A-GPS support No
Bluetooth Yes, v2.0 with A2DP Yes, v2.1 with A2DP Yes, v2.0
Support NFC No No
External Display Connectivity Wifi Direct
Multimedia
E-mail Yes Yes, with Push E-mail Yes, with Push E-mail
Document Reader Yes Yes
FM Radio Yes Yes Yes
Alert Types Vibration, Polyphonic, MP3 Vibration,MP3,WAV ringtones Vibration,MP3,WAV ringtones
PDF Reader Yes Yes
Memory
Phonebook Memory Practically Unlimited Contacts Practically Unlimited Contacts Practically unlimited contacts
Internal Storage 512 MB 180 MB 200 MB
Expandable Memory microSD, upto 32 GB Up to 32 GB microSD, upto 32 GB
Other Features
Sensors Accelerometer, Gyro Accelerometer, Proximity Accelerometer
Additional Features Calendar, Alarm, Calculator Pattern Lock Security,Customizable Menu and Widgets,Live Wallpapers,Intuitive Text Input,One Touch Word Selection,MMS Enabled,Voice Search Pattern Lock Security, Intuitive Text Input, One-touch Word Selection, Voice Search, MMS Enabled,Facebook, Twitter, Google Talk, LinkedIn, We-chat, Whats App, Gmail, YouTube, Play Store, News and Weather Update, Google Play