OS	Nokia Asha Software Platform 1.2, upgradable to Asha Platform 1.4, Fastlane Swipe Multitasking, Nokia Xpress Browser with 90% Data Compression, WhatsApp, LINE, WeChat & Zero Bloatware
Chipset	MediaTek MT6260 (360MHz 32-bit ARM7EJ-S Processor with Integrated 3.5G HSPA Baseband & Hardware Audio DSP)
RAM	64MB RAM
Storage	128MB Internal Flash (4GB SanDisk microSDHC card included in box!)
Display	3.0 inches • 240 x 320 pixels (4:3, Compact 3.0" QVGA 320p 4:3 Capacitive Touchscreen Display with Gorilla Glass 2, 133 ppi)
Main camera	Pro Flagship 5.0 MP Rear Camera with High-Power LED Flash & QVGA Video Recording: 5.0 MP f/2.4 (Fixed Focus from 50cm to infinity, High-Power LED flash, Quick Camera swipe from lock screen, Panorama, QVGA@25fps video recording)
Selfie camera	None
Battery	Monumental 1200 mAh Colossal Monster Battery! (Removable Li-Ion BL-4U, swappable on the go! Powers over 12 hours continuous 2G calling / 4.5 hours continuous 3G calling / 840 hours (over 35 DAYS!) standby / 36 hours continuous MP3 audio playback!), Micro-USB 2.0 charging in box + Battery Saver • Removable Li-Ion 1200 mAh BL-4U (swappable on the go!)
Weight	110.2 g (3.88 oz)

Latest Nokia Asha 503 user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Java; U; en-us; nokia503) UCBrowser8.2.1.144/70/352/UCWEB Mobile UNTRUSTED/1.0	UC Browser 8	SymbianAsha 503
Mozilla/5.0 (Java; U; en-us; nokia503) AppleWebKit/530.13 (KHTML, like Gecko) UCBrowser/8.6.0.199/70/352/UCWEB Mobile UNTRUSTED/1.0	UC Browser 8	SymbianAsha 503
Mozilla/5.0 (Java; U; en-in; nokia503) UCBrowser8.2.1.144/69/352/UCWEB Mobile UNTRUSTED/1.0	UC Browser 8	SymbianAsha 503