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Phone	Samsung Knack U310	Ericsson R278d	Cricket Debut S2 / AT&T Calypso 4	HTC Droid Eris	HTC EVO Design 4G / Hero S (CDMA)
Current U.S. Carriers	(none)	(none)	AT&T	(none)	(none)
Global Availability	Released	Released	Released	Released	Released
Display Size	2.2" diag. 4 : 3	?	6.1" diag. 19.5 : 9	3.2" diag. 5 : 3	4" diag. 16 : 9
Display Resolution & Type	176 x 220 pixels (~128 ppi) LCD (TFT/TFD)	101 x 40 pixels	720 x 1560 pixels (~282 ppi) LCD (TFT/TFD)	320 x 480 pixels (~180 ppi) LCD (TFT/TFD)	540 x 960 pixels (~275 ppi) LCD (TFT/TFD)
Display Refresh	?	?	60 Hz	60 Hz	60 Hz
Battery	1,000 mAh	?	3,000 mAh	1,300 mAh	1,520 mAh
Processor	?	?	2 GHz MediaTek Helio A22 (MT6761WB)	528 MHz MSM7600	1.2 GHz Qualcomm Snapdragon S2 MSM8655
RAM	?	?	3 GB	?	768 MB
Storage	? raw hardware	? raw hardware	64 GB	? raw hardware	4 GB
Main Camera	-	-	8 megapixel	5 megapixel	5 megapixel
Wide Camera	-	-	-	-	-
Tele Camera	-	-	-	-	-
Video Capture	-	-	?	CIF (352 x 288)	720p HD
Front Camera	-	-	5 megapixel	-	1 megapixel
Weight	3.63 oz (103g)	9.28 oz (263g)	5.64 oz (160g)	4.43 oz (126g)	5.22 oz (148g)
Dimensions	3.78" x 2.01" x 0.74" (96 x 51 x 18.8 mm)	5.1" x 2" x 1" (130 x 51 x 25.4 mm)	6.11" x 2.87" x 0.34" (155 x 73 x 8.6 mm)	4.45" x 2.19" x 0.52" (113 x 55 x 13.2 mm)	4.78" x 2.44" x 0.46" (122 x 62 x 11.8 mm)
Form Factor	Clamshell	Slab	Slab	Slab	Slab
Platform / OS	(proprietary)	(proprietary)	Android	Android	Android
Network Bands	CDMA: 850, 1900	TDMA: 850, 1900 AMPS: 850	4G LTE: 2, 3, 4, 5, 7, 12, 14, 20, 30, 66 WCDMA: 1, 2, 4, 5, 8	CDMA: 850, 1900	4G WiMAX: 41 WCDMA: 1, 8 CDMA: 800, 850, 1900 GSM: 850, 1900 *
Data Technology	-	-	LTE (Cat 4)	EVDO rA	WiMAX
Features
Flashlight	-	-	Yes	-	Yes
GPS / Location	Yes	-	n/a	n/a	n/a
Accessibility
Adjustable Text Size	Yes	-	n/a	n/a	n/a
Hearing Aid Compatible	Yes M4, T4 (very tele-coil compatible)	-	Yes M4, T4 (very tele-coil compatible)	Yes M3, T3 (mostly tele-coil compatible)	Yes M4, T4 (very tele-coil compatible)
Multiple Languages	Yes	Yes	n/a	n/a	n/a
TTY/TDD (Digital)	Yes	-	-	Yes	Yes
Alerts
Extra Display	Yes	-	-	-	-
Ringer Profiles	-	Yes	-	-	-
Connectivity
Bluetooth	-	-	Yes	Yes	Yes
Mobile Hotspot	-	-	n/a	n/a	n/a
USB	-	-	Yes USB Type C	Yes Mini-USB	Yes Micro-USB
Wi-Fi	-	-	Yes 5 (802.11 a,ac,b,g,n)	Yes 802.11 b,g	Yes 4 (802.11 b,g,n)
Contacts
Picture ID	-	-	n/a	n/a	n/a
Ringer ID	-	-	n/a	n/a	n/a
Voice Dialing	Yes	-	n/a	n/a	n/a
Customization
Custom Graphics	-	-	n/a	n/a	n/a
Custom Ringtones	-	Yes	n/a	n/a	n/a
Real-Music Ringers	-	-	n/a	n/a	n/a
Data & Network
Data Tethering	-	Yes	n/a	n/a	n/a
WAP / Web Browser	-	Yes	n/a	n/a	n/a
Input
Predictive Text Entry	Yes	Yes	n/a	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
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	-	-	n/a	n/a	n/a
Text Messaging Templates	-	-	n/a	n/a	n/a
Music
FM Radio	-	-	-	-	Yes
Headphone Jack (3.5mm)	-	-	Yes	Yes	Yes
Music Player	-	-	n/a	n/a	n/a
Photo & Video
DLNA	-	-	-	-	Yes
Power
Fast Charging	-	-	Yes	-	-
Productivity
Alarm	Yes	Yes	n/a	n/a	n/a
Calculator	Yes	-	n/a	n/a	n/a
Calendar	Yes	-	n/a	n/a	n/a
Voice Memo	-	-	n/a	n/a	n/a
Software
Games	-	-	n/a	n/a	n/a
Voice
HD Voice	-	-	Yes	-	-
Headset Jack (2.5 mm)	Yes	-	n/a	n/a	n/a
Speaker Phone	Yes	-	Yes	Yes	Yes
	Samsung Knack U310	Ericsson R278d	Cricket Debut S2 / AT&T Calypso 4	HTC Droid Eris	HTC EVO Design 4G / Hero S (CDMA)
	X >	< X >	< X >	< X >	< X

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


Phone	Samsung Knack U310	Ericsson R278d	Cricket Debut S2 / AT&T Calypso 4	HTC Droid Eris	HTC EVO Design 4G / Hero S (CDMA)