Phone calls and texts? Don't let your developers do them.

> To single out 'standup' as a particularly disruptive interruption may be exaggeration.

It isn't an exaggeration, because a standup is also a pending appointment and a mini-presentation. A lot of developer types actually get stressed out about this, no matter how small.

Similar thing with responding to an e-mail. It's insane how much time some people spend on just a one line reply.

Just minimize these things, don't make them part of your routine for routine's sake.