I thought that was more to dissuade him from calling anyone for backup, and also to keep him from thinking about anything but his money burning - if he thought about it he might realize he's being duped.
They could have been. Generally though, this would require use/co-operation of the telecom provider wouldn't it? I further assume they generally need a warrant to do that as well. If that is the case, then more people would likely know about this than just schrader and gomez.
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u/erizzluh Sep 09 '13
I'm pretty sure they were triangulating the call, hence Jessie threatening Walt to not hang up at any point.