Question 3G/2G Confusion

Hi all!!
I have a Chinese based company phone namely QMobile A5Classic. This phone is the same as Gionee CTRL V1. Both have identical hardware, except one, the earlier one (QMobile A5Classic) is a 2G phone but the latter one is 3G. Both have the same hardware chip, i.e MT6575 which supports 3G.
Why is this difference?
Is this due to custom kernel or what? Can this be enabled in some way?
I tried an application, MTK Engineering Mode. This gave access to hidden menus, but some of the options boggled me. I can enable CDMA/WCDMA? Is this even possible? [ see screenshot 1 ]
Another option allowed me to change Video Telephony Settings [ see screenshot 2 ]
If its a kernel thing how can I get around with it?

Please do help me clear this confusion up.

Thanks all in advance!
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Phone List:
  • QMobile A5Classic (Rooted )
  • Samsung GURU
  • QMobile A5 (Exchanged by QMobile to A5Classic )
  • Motorola L6
  • N73 Music Edition (Still Alive!!)
  • LG KP320
  • Motorola C261
  • Nokia 3310

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