Verizon Communications' (NYSE:VZ) planned bid for Vodafone Group's 45 percent stake in Verizon Wireless faces a sizable hurdle. According to the Wall Street Journal, citing sources familiar with the matter, Verizon and Vodafone are at odds over the value of the transaction. Verizon believes the stake is worth around $100 billion, while Vodafone believes it's closer to $130 billion. Although Verizon has not made a formal offer to Vodafone, the two sides are reportedly in discussions and Verizon has hired advisors to help it formulate an offer. Article (sub. req.)