Screen size
equal specss5025 Helix5.0"
s5028 Bolt5.0"
Quick verdict
s5025 Helix leads the measured specs 8-1.
Measured wins
s5025 Helix
8
spec wins
Overall winner
Ties
8
equal specs
s5028 Bolt
1
spec wins
Screen size
equal specsTechnology
s5025 Helix
GSM / HSPA
s5028 Bolt
GSM / HSPA
2G bands
s5025 Helix
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
s5028 Bolt
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands
s5025 Helix
HSDPA 850 / 1700(AWS) / 1900
s5028 Bolt
HSDPA 850 / 1900
Speed
s5025 Helix
HSPA 21.1/5.76 Mbps
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
equal specsStorage
equal specsMain camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
equal specs5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
s5028 Bolt
HSPA 21.1/5.76 Mbps
Announced
s5025 Helix
2015, December. Released 2015, December
s5028 Bolt
2017, April. Released 2017, April
Status
s5025 Helix
Discontinued
s5028 Bolt
Discontinued
Dimensions
s5025 Helix
143.5 x 72.5 x 7.9 mm (5.65 x 2.85 x 0.31 in)
s5028 Bolt
144.8 x 72.8 x 10 mm (5.70 x 2.87 x 0.39 in)
Weight
s5025 Helix
136 g (4.80 oz)
s5028 Bolt
154 g (5.43 oz)
SIM
s5025 Helix
Dual SIM (Micro-SIM, dual stand-by)
s5028 Bolt
Dual SIM (Micro-SIM/ Mini-SIM, dual stand-by)
Type
s5025 Helix
IPS LCD
s5028 Bolt
TFT
Size
s5025 Helix
5.0 inches, 68.9 cm2 (~66.2% screen-to-body ratio)
s5028 Bolt
5.0 inches, 68.9 cm2 (~65.4% screen-to-body ratio)
Resolution
s5025 Helix
720 x 1280 pixels, 16:9 ratio (~294 ppi density)
s5028 Bolt
480 x 854 pixels, 16:9 ratio (~196 ppi density)
Protection
s5025 Helix
Scratch-resistant glass
s5028 Bolt
-
OS
s5025 Helix
Android 5.1 (Lollipop)
s5028 Bolt
Android 6.0 (Marshmallow)
Chipset
s5025 Helix
Mediatek MT6580 (28 nm)
s5028 Bolt
Spreadtrum SC7731C
CPU
s5025 Helix
Quad-core 1.3 GHz Cortex-A7
s5028 Bolt
Quad-core 1.2 GHz Cortex-A7
GPU
s5025 Helix
Mali-400MP2
s5028 Bolt
Mali-400
Card slot
s5025 Helix
microSDHC
s5028 Bolt
microSDHC
Internal
s5025 Helix
8GB 1GB RAM
s5028 Bolt
8GB 1GB RAM
Single
s5025 Helix
13 MP, AF
s5028 Bolt
8 MP, f/2.4, AF
Features
s5025 Helix
LED flash, panorama
s5028 Bolt
LED flash, panorama
Video
s5025 Helix
1080p@30fps
s5028 Bolt
720p@30fps
Single
s5025 Helix
5 MP
s5028 Bolt
2 MP, f/2.8
Video
s5025 Helix
s5028 Bolt
Loudspeaker
s5025 Helix
Yes
s5028 Bolt
Yes
3.5mm jack
s5025 Helix
Yes
s5028 Bolt
Yes
WLAN
s5025 Helix
Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot
s5028 Bolt
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Bluetooth
s5025 Helix
4.0, A2DP, LE
s5028 Bolt
2.1, A2DP
Positioning
s5025 Helix
GPS
s5028 Bolt
GPS
NFC
s5025 Helix
No
s5028 Bolt
No
Radio
s5025 Helix
Stereo FM radio
s5028 Bolt
Stereo FM radio
USB
s5025 Helix
microUSB 2.0
s5028 Bolt
microUSB 2.0
Sensors
s5025 Helix
Accelerometer, proximity
s5028 Bolt
Accelerometer
Type
s5025 Helix
Li-Ion 1950 mAh, non-removable
s5028 Bolt
Li-Ion 2000 mAh battery
Stand-by
s5025 Helix
Up to 240 h (3G)
s5028 Bolt
Up to 240 h (3G)
Talk time
s5025 Helix
Up to 7 h (3G)
s5028 Bolt
Up to 8 h (3G)
Colors
s5025 Helix
Black, Blue
s5028 Bolt
Black, Gold
SAR
s5025 Helix
0.68 W/kg (head) 1.25 W/kg (body)
s5028 Bolt
-