| Manufacturer | |
| Samsung | Sony |
| Announced | |
| December 2011 | June 2012 |
| Status | |
| Available - January 2012 | Available - September 2012 |
| Colors | |
| Black | Serene black, Classic silver |
| Form Factor | |
| Candybar | Candybar |
| Dimension | |
|
110.8 x 63.5 x 11.9 mm (4.36 x 2.5 x 0.47 in) |
103 x 57 x 13 mm (4.06 x 2.24 x 0.51 in) |
| Weight | |
| 112.3 g (3.95.0.11 oz) | 99.4 g (3.49.0.14 oz) |
| 2G Network | |
| GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | |
| HSDPA 900 / 2100 | HSDPA 900 / 2100 - ST21i2 HSDPA 850 / 1900 / 2100 - ST21a2 |
| Messaging | |
| SMS, MMS, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
| OS | |
| Android OS, v2.3 (Gingerbread) | Android OS, v4.0.3 (Ice Cream Sandwich) |
| Processor | |
| 800 MHz Cortex-A5, Qualcomm MSM7225AA [Similar] | |
| GPU | |
| Adreno 200 [Similar] | |
| RAM | |
| 384 MB [Browse Similar] | 512 MB [Browse Similar] |
| Internal Memory | |
| 512 MB ROM | 2.9 GB storage (2.5 GB user available) |
| External Memory | |
| microSD, up to 32GB, 2 GB included | microSD, up to 32 GB |
| 3.5mm Jack | |
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| Radio | |
| Stereo FM radio with RDS | Stereo FM radio with RDS |
| Games | |
| Yes | Yes + Downloadable |
| Loud Speaker | |
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| GPRS | |
| Yes | Up to 86 kbps |
| Edge | |
| Yes | Up to 237 kbps |
| 3G | |
| HSDPA, 7.2 Mbps | HSDPA, 7.2 Mbps; HSUPA, 5.76 Mbps |
| Bluetooth | |
| Yes, v3.0 with A2DP | Yes, v2.1 with EDR |
| Wi-Fi | |
| Wi-Fi 802.11 b/g/n, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot |
| USB | |
| Yes, microUSB v2.0 | Yes, microUSB v2.0 |
| GPS | |
| Yes, with A-GPS support | Yes, with A-GPS support |
| Browser | |
| HTML, Adobe Flash | HTML5, Adobe Flash |
| Internal | |
| 512 MB ROM, 384 MB RAM | 2.9 GB storage (2.5 GB user available), 512 MB RAM |
| Expandable Storage | |
| microSD, up to 32GB, 2 GB included | microSD, up to 32 GB |
| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| NFC | |
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| Type | |
| Standard battery, Li-Ion | Li-Ion Battery |
| Capacity | |
| 1350 mAh | 1500 mAh |
| Stand by | |
| Up to 528 h | Up to 350 h (2G) Up to 360 h (3G) |
| Talk Time | |
| Up to 9 h | Up to 5 h (2G) Up to 6 h (3G) |