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These instruments are most often used in drum and bugle corps bands and other musical groups.
Soprano bugles can have either piston valves or rotary valves, so they are not completely valve-less like regular bugles are.
Nowadays, the Bb trumpet is the most commonly found trumpet in orchestras and symphonies, and the differences between the C and Bb trumpets are very subtle.
Some Bb trumpets have a fourth valve, but these are not commonly found in orchestras or symphonies.
Some beginning musicians like it because it is easily held, due mostly to the fact that it is slightly compressed.
This has resulted in a non-standardized look and sound, which means pocket trumpets can vary greatly among themselves.
In fact, many of them are poorly made and therefore, they are often used only for practice and as a novelty item.
However, because the sizes and configurations of these items are somewhat different, they really are two different types of instruments.
This is a replica of a Bb trumpet but is much smaller.