Apple is expected to dump its exclusive iPhone deal with AT&T next year. Speculation is the firm will ink a second US distro deal with Verizon - but now fresh speculation has emerged suggesting it will be T-Mobile, rather than Verizon, that emerges as Appleās second US iPhone carrier.This news emerges as the battle between Verizon and AT&T grows uglier as the former network puts its weight behind the Motorola Droid phone, which is alleged to have sold 800,000 units since launch.Verizon originally rejected Apple's exclusivity offer three years ago over control issues. The company has