mobile

I am facing the problem of the SIM2(GSM mode only) going out of network when the data is turned-on on SIM1(WDCMA mode only).

I use the following
SIM1 - DATA
SIM2 - Primary calling purpose

Following pattern observed

SIM1 SIM2 Data Turned Observations
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GSM GSM turned on-either sims Working and both SIMs available on network
WCDMA GSM turned on-SIM2 Working and both SIMs available on network
WCDMA GSM turned on-SIM1 SIM1 Working, SIM2 not available on network (if anyone calls on sim1 it is not reachable)

Signal icon does not rightly depict the same for the third combination.

I have made the above observations by actually calling from other phone with the above combinations.

Thanks
janardhan