Signal switches from digital to analog and caller ID comes up unknown caller unlaess in analog only mode

I have a Motorola W315. I live in an area where my signal bounces from digital to analog. If a call comes in at my home and I do not have Analog only on then caller ID shows up unknown. I set analog only on and if I move to an area with digital signal, the analog on automatically switches to off. I move back to an area without digital signal and a call now comes in as unknown again. I know the signal switches back and forth in my house because my Motorola 120e shows this. On the network display, there is a set mode section. The options are automatic A, automatic B, or home only. I have tried all 3 with the same results as above. Can these options be programmed as analog only or switch to analog? Is this where I would be able to solve this problem?