CW only: 144.0-144.1 MHz (mandated by FCC Part 97)
 CW/SSB
 Satellite (mostly downlink); CW, SSB, FM voice & digital modes
 FM simplex
 Simplex internet links
 Repeater inputs
 Repeater outputs
 Repeater inputs & outputs interleaved
 D-Star repeater inputs
 D-Star repeater outputs
 Digital (AFSK)

 

So just WHERE can I operate simplex???

This is a question that has stumped even the most seasoned FM operator for many years.  Now, finally you have the answer in this summary of area recognized simplex frequencies:

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