Almost every carrier story we post has at least a few versions of the following comments—"I would totally use carrier X, but it doesn't work very well where I live," and "I don't know why everyone is always talking smack about carrier Y, it works great in my area." According to the Wall Street Journal, Google's rumored MVNO could put an end to that by not only supporting both T-Mobile and Sprint, but by switching between the networks automatically depending on which signal is better.