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Phone	Samsung SGH-X640	Samsung Galaxy J7 (2017, GSM) / J7 Prime / Halo	Samsung Wafer R510	ZTE Blade Vantage	ZTE Engage LT / Engage MT
Current U.S. Carriers	(none)	(none)	(none)	(none)	(none)
Global Availability	Released	Released	Released	Released	Released
Display Size	?	5.5" diag. 16 : 9	1.9" diag. 4 : 3	5" diag. 16 : 9	4" diag. 5 : 3
Display Resolution & Type	128 x 160 pixels LCD (TFT/TFD)	720 x 1280 pixels (~267 ppi) LCD (TFT/TFD)	220 x 176 pixels (~148 ppi) LCD (TFT/TFD)	480 x 854 pixels (~196 ppi) LCD (TFT/TFD)	480 x 800 pixels (~233 ppi) LCD (TFT/TFD)
Display Refresh	?	60 Hz	?	60 Hz	60 Hz
Battery	800 mAh	3,300 mAh	800 mAh	2,500 mAh	1,900 mAh
Processor	?	1.6 GHz Samsung Exynos 7870	?	1.1 GHz Qualcomm Snapdragon 210 (MSM8909)	?
RAM	?	2 GB	?	2 GB	1 GB
Storage	? raw hardware	16 GB *	? raw hardware	16 GB	4 GB
Main Camera	Yes	8 megapixel	1 megapixel	8 megapixel	3 megapixel
Wide Camera	-	-	-	-	-
Tele Camera	-	-	-	-	-
Video Capture	-	1080p HD	?	720p HD	WVGA / 480p
Front Camera	-	Yes	-	2 megapixel	Yes
Weight	3 oz (85g)	5.8 oz (164g)	2.47 oz (70g)	5.29 oz (150g)	5.09 oz (144g)
Dimensions	3.43" x 1.81" x 0.91" (87 x 46 x 23.1 mm)	5.96" x 3.01" x 0.34" (151 x 76 x 8.6 mm)	4.45" x 1.97" x 0.33" (113 x 50 x 8.4 mm)	5.73" x 2.85" x 0.36" (146 x 72 x 9.2 mm)	4.78" x 2.54" x 0.46" (121 x 64 x 11.7 mm)
Form Factor	Clamshell	Slab	Slab	Slab	Slab
Platform / OS	(proprietary)	Android	(proprietary)	Android	Android
Network Bands	GSM: 900, 1800, 1900	4G LTE: 2, 3, 4, 5, 7, 12 WCDMA: 2, 4, 5 GSM: 850, 900, 1800, 1900 *	CDMA: 850, 1900	4G LTE: 2, 4, 5, 13	CDMA: 850, 1700, 1900
Data Technology	GPRS	LTE (Cat 6)	EVDO r0	LTE (Cat 4)	EVDO rA
Features
Flashlight	-	Yes	-	Yes	-
GPS / Location	-	n/a	Yes	n/a	n/a
Accessibility
Adjustable Text Size	-	n/a	-	n/a	n/a
Hearing Aid Compatible	-	Yes M3, T3 (mostly tele-coil compatible)	Yes M3, T3 (mostly tele-coil compatible)	Yes M4, T4 (very tele-coil compatible)	-
Multiple Languages	Yes	n/a	Yes	n/a	n/a
TTY/TDD (Digital)	-	Yes	Yes	Yes	Yes
Connectivity
Bluetooth	-	Yes	Yes	Yes	Yes
USB	-	Yes Micro-USB	-	Yes Micro-USB	Yes Micro-USB
Wi-Fi	-	Yes 5 (802.11 a,ac,b,g,n)	-	Yes 4 (802.11 b,g,n)	Yes
Contacts
Picture ID	Yes	n/a	Yes	n/a	n/a
Ringer ID	Yes	n/a	-	n/a	n/a
Voice Dialing	-	n/a	Yes	n/a	n/a
Customization
Custom Graphics	Yes	n/a	Yes	n/a	n/a
Custom Ringtones	Yes	n/a	Yes	n/a	n/a
Real-Music Ringers	-	n/a	-	n/a	n/a
Data & Network
Data Tethering	-	n/a	-	n/a	n/a
WAP / Web Browser	Yes	n/a	Yes	n/a	n/a
Input
Predictive Text Entry	Yes	n/a	Yes	n/a	n/a
Side Keys	Yes	Yes	Yes	Yes	Yes
Touch Screen	-	Yes Capacitive	-	Yes Capacitive	Yes Capacitive
Memory
Memory Card Slot	-	Yes	Yes	Yes	Yes
Messaging
Email Client	-	n/a	-	n/a	n/a
EMS / Picture Messaging	Yes	n/a	-	n/a	n/a
Instant Messaging	-	n/a	-	n/a	n/a
MMS	Yes	n/a	Yes	n/a	n/a
Text Messaging Templates	Yes	n/a	-	n/a	n/a
Music
FM Radio	-	Yes	-	-	-
Headphone Jack (3.5mm)	-	Yes	-	Yes	Yes
Music Player	-	n/a	Yes	n/a	n/a
Stereo Speakers	-	-	Yes	-	-
Productivity
Alarm	Yes	n/a	Yes	n/a	n/a
Calculator	Yes	n/a	Yes	n/a	n/a
Calendar	Yes	n/a	Yes	n/a	n/a
To-Do List	Yes	n/a	-	n/a	n/a
Voice Memo	Yes	n/a	Yes	n/a	n/a
Software
BREW	-	n/a	Yes	n/a	n/a
Games	Yes	n/a	Yes	n/a	n/a
Java (J2ME)	Yes	n/a	-	n/a	n/a
Voice
HD Voice	-	Yes	-	Yes	-
Headset Jack (2.5 mm)	Yes	n/a	-	n/a	n/a
Speaker Phone	Yes	Yes	Yes	Yes	Yes
	Samsung SGH-X640	Samsung Galaxy J7 (2017, GSM) / J7 Prime / Halo	Samsung Wafer R510	ZTE Blade Vantage	ZTE Engage LT / Engage MT
	X >	< X >	< X >	< X >	< X

NOTE: Differences are highlighted with bold / black text for visual clarity only.


Phone	Samsung SGH-X640	Samsung Galaxy J7 (2017, GSM) / J7 Prime / Halo	Samsung Wafer R510	ZTE Blade Vantage	ZTE Engage LT / Engage MT