Instead of so much focus on why an intruder would try and access VM, why not focus on why MW's number was dialed.
I posted on the theory thread in the middle of November. Since then, my thoughts have not changed much, except that I am more leaning to DB involvement now. On that thread, I said that I believed Jersey had those phones. I still believe that. Whether he stole the phones or whether he acquired them by finding them after they had been thrown away, I don't know.
My theory is that the missing cells phones are not related to missing BL. That probably sounds weird to most, but so be it.
Jersey having those cell phones, calling MW at midnight, going out and setting a fire locally, then coming back to wherever in the area he is squatting and playing around with the phone until the battery went dead. We know he doesn't have his own phone, because MW said he gave out her number to reach him. He is likely not adept at how to use some cell phones. That is not surprising to me at all, because I only use my new cell phone for emergency. Believe me when I say that I have accidentally accessed voice mail when I pushed a button I didn't understand. I have made a lot of mistakes on my cell phone and still don't understand how to use it.
It is a fact that a call was attempted to MW. MW, whom I do believe, does not know DB. There is no reason for DB to be calling that number. Therefore, until someone comes up with one, I have to say DB is not the caller on those cell phones, either the one at midnight or the ones at 3am.