Consumer Reports: Verizon Best, AT&T Worst > farce

You see, an MRAB (Multi-RAB - Radio Access Bearer) call (technical term for a simultaneous voice and data call) is much more prone to dropping calls. Many handsets are very bad about dropping these MRAB calls. To help prevent these dropped calls, which helps customer satisfaction, AT&T made some optimizations to still provide useable data speeds while on a voice call, but provide more robustness to the radio connection and reduce the drops.

AT&T was, and is, simply looking to help customers and prevent dropped calls and other issues, yet they still get bashed. They can't win, unfortunately. Especially when sites like this one are seemingly on a mission to paint them in the worst light possible.