Sony Ericsson Xperia Arc LT15i telah menggunakan OS Android 2,3 (Gingerbread), yang di lengkapi dengan prosesor 1Ghz, dan layar yang berukuran besar yaitu 4,2 inchi. Berikut spesifikasi dari Sony Ericsson Xperia Arc LT15i :

General: Network:
2G GSM 850 / 900 / 1800 / 1900
3G HSDPA 900 / 2100
HSDPA 850 / 1900 / 2100 / 800

Layar: Tipe:
LED-backlit LCD, capacitive touchscreen, 16M colors; Ukuran:
480 x 854 pixels, 4.2 inches
- Scratch-resistant surface
- Accelerometer sensor for auto-rotate
- Multi-touch input method
- Sony Mobile BRAVIA Engine
- Proximity sensor for auto turn-off
- Timescape UI

Sound: Audio Jack:
3,5mm; Fitur:
Vibration, MP3, WAV ringtones; Speakerphone:
Ya

Memory: Internal:
320 MB storage, 512 MB RAM; External:
microSD, up to 32GB, 8 GB included

Data: 3G:
HSDPA, 7.2 Mbps; HSUPA, 5.76 Mbps; EDGE:
Up to 237 kbps; GPRS:
Up to 86 kbps; WLAN:
Wi-Fi 802.11b/g/n, DLNA; Bluetooth:
Ya, v2.1 with A2DP; Infrared:
-; Cable/Port:
Ya, v2.0 microUSB

Kamera: Primer(belakang):
8 MP, 3264x2448 pixels, autofocus, LED flash
Touch focus, image stabilization, geo-tagging, face and smile detection; Sekunder(depan):
-; Video Record:
Yes, 720p@30fps

Fitur: Sistem Operasi(OS):
Android OS, v2.3 (Gingerbread); CPU:
1GHz Scorpion processor, Adreno 205 GPU, Qualcomm MSM8255 Snapdragon; Browser:
HTML; GPS:
Ya, with A-GPS support; Messaging:
SMS (threaded view), MMS, Email, Push email, IM; Java:
Ya, via third-party application
- Digital compass
- HDMI port
- Active noise cancellation with dedicated mic
- TrackID music recognition
- NeoReader barcode scanner
- Google Search, Maps, Gmail,
YouTube, Calendar, Google Talk
- Facebook and Twitter integration
- Document viewer
- Adobe Flash 10.1
- Voice memo/dial/commands
- Predictive text input; Radio:
Stereo FM radio with RDS

Baterai: Stand by:
Up to 430 h (2G) / Up to 400 h (3G); Talk Time:
Up to 7 h (2G) / Up to 7 h (3G); Tipe:
Standard battery, Li-Po 1500 mAh