(Image credit: Tom's Guide / John Velasco) It seems rare that major companies would want to collaborate on something to positively affect the regular consumer these days. But some of the best phone carriers are doing just that, in an attempt to end dead zones. No, not the novel by Stephen King, or the excellent movie starring Christopher Walken. We're talking about wireless dead zones: areas with no compatible cell signal that cut you off from all mobile services — including calls and data.  AT&T, Verizon and T-Mobile now have an agreement in principle to help end the problem of dead zones by sharing their resources. The announcement is fairly light on details, but according to Verizon, the deal will not involve building a bunch more cell towers across the country. Instead, it's going to focus on satellite connectivity and beam a connection to your device from space from a "unified platform." The overall aim is to, in the words of the big three, "nearly eliminate" dead zones within the U.S.…