Default Doubt : gprs or edge

Friends,
Is gprs or edge software or hardware dependent?
I mean is two working with hardware or software.
Actually i am using lg optimus vu 2.
My network vodafone.and i m subscribed as a 2g member.
My mobile showing only G.
not E.Here is my net speed only 10kBps.
When i use previous samsung Mobile i got E and the speed was 20-40KBps.

Please let me know what was the problem?
Is it from mobile or network.
If not from network.
How to CONVERT G to EDGE speed?
THANKS

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