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HTC Desire 820 Dual Sim signal problem

Hi, I have HTC Desire 820 Dual SIM. SIM 1 Slot is defective, i use SIM 2 Slot where i want to use 3G\4G network but when i change network from 2G to 3G\4G SIM card signals disappeared. "Limited Service" appears. I know that 3G frequency i.e. 2100 MHz and 4G LTE frequency i.e. Band 3 1800 MHz supported by this device.

Any one give me expert opinion to rectify this anomaly.

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Hi my phone was duel sim one sim working second sim not working is net signal coming not old help me

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