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| Phone | Nokia Lumia 521 / 520 | Kyocera DuraXE Epic / DuraXA Equip | ZTE Agent | 
| Current U.S. Carriers | (none) | US Cellular | (none) | 
| Global Availability | Released | Released | Released | 
| Specifications | |||
|---|---|---|---|
| Display Size | 
			4" diag. 5 : 3  | 
		
		
			2.6" diag. 4 : 3  | 
		
		
			2.4" diag. 4 : 3  | 
	
| Display Resolution & Type | 
			480 x 800 pixels (~233 ppi) LCD (TFT/TFD)  | 
		
		
			240 x 320 pixels (~154 ppi) LCD (TFT/TFD)  | 
		
		
			240 x 320 pixels (~167 ppi) LCD (TFT/TFD)  | 
	
| Display Refresh | ? | ? | ? | 
| Battery | 1,430 mAh | 1,770 mAh | 900 mAh | 
| Processor | 1 GHz Qualcomm Snapdragon S4 MSM8270 | 1.2 GHz Qualcomm Snapdragon 215 | ? | 
| RAM | 512 MB | 2 GB | ? | 
| Storage | 8 GB | 16 GB | ? raw hardware | 
| Main Camera | 5 megapixel | 5 megapixel | 1 megapixel | 
| Wide Camera | - | - | - | 
| Tele Camera | - | - | - | 
| Video Capture | 720p HD | 720p HD | ? | 
| Front Camera | - | - | - | 
| Weight | 
			4.39 oz (124g)  | 
		
		
			6.8 oz (193g)  | 
		
		
			3.53 oz (100g)  | 
	
| Dimensions | 
			4.72" x 2.52" x 0.39" (120 x 64 x 9.9 mm)  | 
		
		
			4.36" x 2.22" x 1.07" (111 x 56 x 27.2 mm)  | 
		
		
			4.3" x 1.9" x 0.6" (109 x 48 x 15.2 mm)  | 
	
| Form Factor | Slab | Clamshell | Slab | 
| Platform / OS | Windows | (proprietary) | (proprietary) | 
| Network Bands | 
			 4G LTE: 2, 4, 5, 12, 14, 66 WCDMA: 1, 2, 4, 5  | 
		
		
			 CDMA: 850, 1700, 1900  | 
	|
| Data Technology | HSPA+ 21 | LTE (Cat 4) | 1xRTT | 
| Features | |||
| Barometer | - | Yes | - | 
| Flashlight | - | Yes | - | 
| GPS / Location | n/a | Yes | Yes | 
| Ruggedized | - | Yes | - | 
| Water-Resistant | - | 
			Yes IPX8 (SCUBA)  | 
		
		- | 
| Accessibility | |||
| Adjustable Text Size | n/a | Yes | - | 
| Hearing Aid Compatible | Yes | Yes | Yes | 
| Multiple Languages | n/a | Yes | Yes | 
| TTY/TDD (Digital) | Yes | Yes | Yes | 
| Alerts | |||
| Extra Display | - | Yes | - | 
| Connectivity | |||
| Bluetooth | Yes | 
			Yes Classic Audio  | 
		
		
			Yes Classic Audio  | 
	
| Mobile Hotspot | n/a | Yes | - | 
| USB | Yes | 
			Yes USB Type C  | 
		
		
			Yes Micro-USB  | 
	
| Wi-Fi | Yes | 
			Yes 4 (802.11 a,b,g,n)  | 
		
		- | 
| Contacts | |||
| Picture ID | n/a | Yes | - | 
| Ringer ID | n/a | Yes | Yes | 
| Voice Dialing | n/a | Yes | - | 
| Customization | |||
| Custom Graphics | n/a | Yes | Yes | 
| Custom Ringtones | n/a | Yes | Yes | 
| Real-Music Ringers | n/a | Yes | Yes | 
| Data & Network | |||
| Data Tethering | n/a | Yes | - | 
| WAP / Web Browser | n/a | Yes | Yes | 
| Input | |||
| Predictive Text Entry | n/a | Yes | Yes | 
| Side Keys | Yes | Yes | Yes | 
| Touch Screen | Yes | - | - | 
| Memory | |||
| Memory Card Slot | Yes | Yes | Yes | 
| Messaging | |||
| Email Client | n/a | Yes | Yes | 
| Instant Messaging | n/a | - | Yes | 
| MMS | n/a | Yes | Yes | 
| Text Messaging Templates | n/a | Yes | Yes | 
| Music | |||
| FM Radio | - | Yes | - | 
| Headphone Jack (3.5mm) | Yes | Yes | Yes | 
| Music Player | n/a | Yes | Yes | 
| Productivity | |||
| Alarm | n/a | Yes | Yes | 
| Calculator | n/a | Yes | Yes | 
| Calendar | n/a | Yes | Yes | 
| To-Do List | n/a | - | - | 
| Voice Memo | n/a | Yes | Yes | 
| Software | |||
| BREW | n/a | - | Yes | 
| Games | n/a | - | Yes | 
| Voice | |||
| HD Voice | - | Yes | - | 
| Push-To-Talk | - | Yes | - | 
| Speaker Phone | Yes | Yes | Yes | 
| Nokia Lumia 521 / 520 | Kyocera DuraXE Epic / DuraXA Equip | ZTE Agent | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | Nokia Lumia 521 / 520 | Kyocera DuraXE Epic / DuraXA Equip | ZTE Agent | 











