Micromax canvas 2 plus detects 3g signals but not 2g signals

I have micromax canvas 2 plus a110q. The funny thing is that my mobile detects only 3g signals but not 2g. When i switch to 2g only i receive not signals, but with 3g every thing is fine and goes well.
I have tried different SIM's. Even in the network settings i get the list of 3g services but not 2g. I have flashed my android with stock rom and even with custom rom's but the problem persists.
Can someone please help.......

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