| Manufacturer | |
| Samsung | Sony |
| Announced | |
| August 2011 | June 2012 |
| Status | |
| Available - October 2011 | Available - August 2012 |
| Colors | |
| Metallic Gray | Classic Black, Classic White, Deep Red, Navy Blue |
| Form Factor | |
| Candybar | Candybar |
| Dimension | |
|
104 x 58 x 11.5 mm (4.09 x 2.28 x 0.45 in) |
103 x 57 x 13 mm (4.06 x 2.24 x 0.51 in) |
| Weight | |
| 97.5 g (3.42.0.18 oz) | 99.4 g (3.49.0.14 oz) |
| 2G Network | |
| GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 |
| 3G Network | |
| HSDPA 900 / 2100 | HSDPA 900 / 2100 - ST21i HSDPA 850 / 1900 / 2100 - ST21a |
| Messaging | |
| SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
| OS | |
| Android OS, v2.3.5 (Gingerbread) | Android OS, v4.0.3 (Ice Cream Sandwich) |
| Processor | |
| 830 MHz ARMv6 processor, Exynos chipset [Similar] | 800 MHz, Qualcomm MSM7227A [Similar] |
| GPU | |
| Mali-400MP [Similar] | Adreno 200 [Similar] |
| RAM | |
| 290 MB [Browse Similar] | 512 MB [Browse Similar] |
| Internal Memory | |
| 180 MB | 2.9 GB storage (2.5 GB user available) |
| External Memory | |
| microSD, up to 32GB | 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 + downloadable | 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, HS | Yes, v2.1 with A2DP |
| Wi-Fi | |
| Wi-Fi 802.11 b/g/n, Hotspot functionality | 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 | |
| WAP 2.0/xHTML, HTML | HTML |
| Call Records | |
| Yes | Practically unlimited |
| Internal | |
| 180 MB, 290 MB RAM | 2.9 GB storage (2.5 GB user available), 512 MB RAM |
| Expandable Storage | |
| microSD, up to 32GB | 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 | Standard battery, Li-Ion |
| Capacity | |
| 1200 mAh | 1500 mAh |
| Stand by | |
| Up to 850 h (2G) Up to 540 h (3G) |
Up to 470 h (2G) Up to 545 h (3G) |
| Talk Time | |
| Up to 17 h (2G) Up to 6 h 20 min (3G) |
Up to 5 h (2G) Up to 4 h 30 min (3G) |