What is the speaker click?

I get this rat-tat-tat sound near radios, speakers, etc. when my phone is receiving or sending data to/from the network.

1. What the heck is this?
2. Is it specific to Nextel?
3. Is there anything I can do to minimize it?

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all cell phones do it, its the radio wavez, wanna see something rally cool? place your phone under your monitor and watch the screen get all trippy