End Result: Samsung I637 jack is better option if we compare both phones features. Please find details below.
Same Features in Nokia E71x and Samsung I637 Jack:

Both phones are 3g capable
Same LCD pixels 320 x 240
Both phones have full QWERTY keyboard
Both cell phones have Wi-Fi
Both phones have 3.15 MP camera
Java
GPS with A-GPS support
Bluetooth
No Radio

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