Many technology studies have conceptualized transitions between
technological generations as a series of S-curve performance
improvements over time. Surprisingly, the interregnum between successive
technological generations has received little attention. To understand
what happens in the interregnum, we build upon a framework of
technological change as happening within an ecosystem that is
characterized by both momentum and inertia. Applying this framework to
study the mobile communications ecosystem, we found that the transition
between 2G to 3G wireless was far from sequential. Different parts of
the ecosystem evolved at different rates exerting both inertia and
momentum with 'collateral technologies' playing an important role in
shaping the transition path that unfolded. Based on this study we
suggest that, rather than a distinct or unitary shift from an old to a
new technology, transitions proceed in a zigzag manner resulting in the
emergence of hybrid technologies. These processes hold implications for
both theory and practice that we explore in this paper