Sony Ericsson Xperia Arc S (LT18a) vs Motorola Primus (XT621)
Side by side comparison between Sony Ericsson Xperia Arc S vs Motorola Primus phones, differences, pros, cons and full specifications. What's the better?
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What's the better phone? Sony Ericsson Xperia Arc S (LT18a)
The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!
17 Advantages 
3 Advantages | 22 Common items in both devices |
| Until 32GB microSD, microSDHC |
| 16 million |
| 233 PPI |
| LED flash |
| Only digital zoom |
| HD (1280x720) |
| Capacitive |
| +15 specs and more in the table below |
Check the comparison table below for more items that are not evaluated in comparison score above.
Highlight differences Clear highlight📱 Model features | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| Model | Xperia Arc S (LT18a) | Primus (XT621) |
| Other model names | Sony Xperia Arc S LT18, Sony Ericsson Ayame | Nextel Motorola Primus XT621, Motorola XT621 Primus |
| Country or region available |     (Latin America), Brazil, Canada, USA |  (Global, International), (Latin America) |
| Brand | Sony Ericsson | Motorola |
| Release date | 9/1/2011 | 1/1/2013 |
| Depth | 8.7 millimeters (0.34 inches) | 12.3 millimeters (0.48 inches) |
| Size (width x height) | 63 x 125 millimeters (2.48 x 4.92 in) | 60 x 119 millimeters (2.36 x 4.69 in) |
| Weight | 117 grams (4.1 ounces) | 145 grams (5.08 ounces) |
| Build, materials | Plastic body, glass front | feature not registered |
| Protection against water and others | Not supported | Not supported |
📲 Display | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| Display type | TFT LED-Backlit LCD | TFT LCD |
| Screen size | 4.2" inches | 4" inches |
| Screen-to-body ratio | ~61.7% (screen-to-body ratio) | ~63.8% (screen-to-body ratio) |
| Display resolution | 480x854 pixels | 480x800 pixels |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 233 PPI | 233 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Scratch-resistant glass | Gorilla Glass |
| Refresh rate | 60Hz | feature not registered |
| Display features | Sony Mobile BRAVIA Engine | feature not registered |
🤖 Operating System | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| System version | Android 2.3.4 Gingerbread | Android 2.3.6 Gingerbread |
| Firmware update | Android 4.0.4 Ice Cream Sandwich ICS | feature not registered |
| User Interface | feature not registered | feature not registered |
⚙️ Processor | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| Chipset | 32bit: Qualcomm Snapdragon S2 (MSM8255T) (45nm) | 32bit: Qualcomm Snapdragon S2 MSM8255T (45nm) |
| CPU | Single-core, 1 processor: 1x 1.4GHz Scorpion (Single-core) | Single-core, 1 processor: 1x 1.2GHz Scorpion (Single-core) |
| GPU graphical controller | Qualcomm Adreno 205 (266MHz) | Qualcomm Adreno 205 |
| Performance (benchmark) | feature not registered | feature not registered |
💽 Memory and storage | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| RAM memory | 512MB LPDDR2 | 1GB LPDDR2 |
| Internal storage | 1GB (320MB available) | 4GB (1GB available) |
| External storage | Until 32GB microSD, microSDHC (dedicated slot) | Until 32GB microSD, microSDHC (dedicated slot) |
📶 Mobile networks | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| Dual-SIM | Not supported | Not supported |
| SIM card | 1 slot (Single-SIM) Standard mini-SIM (2FF) | 1 slot (Single-SIM) Standard mini-SIM (2FF) |
| Maximum Download / Upload | 14.4/5.76 Mbps | 7.2 Mbps |
| Network technology | 2G, 3G | 2G, 3G |
| Frequency, bands | Expand band details Collapse details | |
| GSM MHz band | Quad-Band 850/900/1800/1900 | Quad-Band 850/900/1800/1900 |
| Primary 2G network | GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
| Primary 3G network | UMTS 800/850/1900/2100 | iDEN 800 UMTS 2100/1900/1700 |
| Primary 4G network | Not supported | Not supported |
| Primary 5G network | Not supported | Not supported |
| Primary data network | CSD, GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+ | iDEN, GPRS, EDGE, UMTS, HSDPA, HSUPA |
| Secondary 2G network | Not supported | Not supported |
| Secondary 3G network | Not supported | Not supported |
| Secondary 4G network | Not supported | Not supported |
| Secondary data network | Not supported | Not supported |
📷 Camera | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| Back camera (main camera) | 8 megapixels | 5 megapixels |
| Main camera resolution | 3264x2448 pixels | 2592x1944 pixels |
| Video recording (primary) | HD (1280x720) 30 fps | HD (1280x720) 30 fps |
| Flash | LED flash | LED flash |
| Focal aperture | f/2.4 (aperture) | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
| Autofocus | Autofocus | Not supported |
| Touch focus | Supported | Supported |
| Image stabilization | EIS: Digital stabilization | Not supported |
| Zoom | Only digital zoom | Only digital zoom |
| Face/smile detection | Face detection, Smile detection | Face detection, Smile detection |
| BSI sensor | Supported | Not supported |
| HDR | Not supported | Not supported |
| Camera extras | feature not registered | feature not registered |
📸 Front camera | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| Front camera (secondary) | Not supported | Not supported |
| Front camera resolution | Not supported | Not supported |
| Video recording (secondary) | Not supported | Not supported |
| Front flash | Not supported | Not supported |
| Focal aperture | feature not registered | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
🔉 Sound and multimedia | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| Loudspeaker | Mono sound (not stereo) | Supported |
| Active noise cancellation | 2 microphones | Not supported |
| Radio | FM (RDS) | FM |
| TV | Not supported | Not supported |
| Video formats | MP4, H.263, H.264, WMV | MP4, H.264, H.263 |
| Audio formats | MP3, eAAC+, WMA, WAV | MP3, WAV, AAC+ |
🔌 Connectivity | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| USB | MicroUSB 2.0 | MicroUSB 2.0 |
| Audio output | 3.5mm jack | 3.5mm jack |
| TV output | Micro HDMI Type D | Not supported |
| Bluetooth | 2.1 + A2DP | 2.1 + A2DP |
| WiFi | 802.11 b/g/n [wifi4] (2.4GHz) WiFi hotspot | 802.11 b/g/n [wifi4] (2.4GHz) |
| DLNA | Supported | Not supported |
| GPS | A-GPS, GeoTagging | A-GPS, GeoTagging |
| NFC | Not supported | Not supported |
| Infrared port | Not supported | Not supported |
🧭 Sensors | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| Sensors | Accelerometer Ambient light sensor Compass Proximity sensor | Accelerometer Ambient light sensor Proximity sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| Battery type | LiPo: li-ion polymer (Removable) BA750 | Li-Ion: lithium-ion (Removable) BP7X |
| Battery capacity | 1500 mAh | 1860 mAh |
| Charger, watts | Wired charging | Wired charging |
| Inductive / wireless charging | Not supported | feature not registered |
| Talk time autonomy | 7.6 hours | feature not registered |
| Standby | 460 hours (19.2 days) | feature not registered |
➕ Other features | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| Call control | Voice dialing, Voice recorder, Voice commands | Voice recorder |
| Messaging | SMS (T9), MMS, E-mail, Push mail | SMS (T9), MMS, E-mail, Push mail |
| Hands-free calling | Supported | Supported |
| Video calling | Not supported | Not supported |
| Ringtones | Polyphonic and customized | Polyphonic and customized |
| Web browser | HTML, XHTML, Flash player | HTML, XHTML, Flash player |
| Antenna | Internal antenna | Internal antenna |
| Qwerty physical keyboard | Not supported | Not supported |
| Miscellaneous | • Colors: Pure White, Midnight Blue, Misty Silver, Gloss Black, Sakura Pink • 8GB microSD included Open ES 1.1 • SE Timescape Java framework | • Colors: Black • Push-to-Talk (PTT) • WiFi hotspot Java framework |
☢️ Radiation rate | ||
| Sony Ericsson Xperia Arc S (LT18a) | Motorola Primus (XT621) | |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | 1.23W/kg (head), 0.42W/kg (body) |
| SAR 2W/kg (Europe, UK, etc.) | 0.66W/kg (head) | 0.73W/kg (head), 0.31W/kg (body) |