If your not receiving calls from someone whos trying to call you on your lg g3 it can be that you might have accidentally put them on your auto reject list. To check if this has happened go into the phone option on your lg g3 click the options tab and then click settings. From in here click on call and then, and then click on call rejection and then auto reject list. So if you have every rejected someones call on your lg g3 the number might be saved in here. If that is the case simply take the number off the list, and you will be all set.