Not all devices implement fully and correctly the Android telephony interface. If the device does not provide dual sim signal strengths to the API17+ Android telephony interface, then the dual sim functionality of our app can not work. This is not our limitation, but it is a device/firmware issue.

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Non-MediaTek devices with Android < 5.0 do not support our dual SIM app functionality. It is an Android/device issue.

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In Release 3.12.0 we deployed a largely updated dual SIM engine. 

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If the dual SIM functionality does not work in your phone, please email us the system info/feedback from the app settings