not receiving calls, delayed messages

Yusong  SunYusong Sun Posts: 1FreedomPop Newbie
I have a BYOD phone Motorola Photon. I can make and receive calls on both wifi and mobile network. The problem is when the phone is idling (screen off), or when moving away from the the wifi, no call can come in. I suspect if the wifi went to sleep, or switch to mobile data. The app may not register itself onto the mobile network (or not soon enough). Is there any solution for this?
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