I can no longer make calls to a specific phone number with my cell phone (I also can't make calls to this number with my wife's cell phone). My wife and I both have service through AT&T and the number I am trying to call is through Verizon but I have tried another phone with service through AT&T and I was able to make a call to the Verizon phone. I can text the Verizon phone and I can also receive calls and texts from it on my phone. Any ideas about what the problem could be?