'Breaking Bad,' Season 5, Episode 14, 'Ozymandias': review

I don’t agree that GPS tracking was the reason they didn’t want him to hang up for two reasons.

  1. Aren’t Gomey and Hank supposed to be going “renegade” on this investigation (withouth the aid of the DEA)?
  2. Can’t you track a cellphone whether it is on or off? (You can)

Is it possible they didn’t want to let Walt stop talking so that he wouldn’t realize he was being ensnared in a trap? So he wouldn’t “stop and think”.

I like my explanation best:)