for example the t-mobile blackberry bold 9900 is prices at 299.99 with a two year contract while sprints blackberry bold 9930 is priced at 199.99 with two year contract, and verizon wireless bold 9930 is priced at 249.99 w/ 2 years. cause i am wanting to get the bold but i have a&tt but they do not have the bold; so im wondering why is there a big difference in price if its the same phone?