  Quantum steering can be detected via the violation of steering inequalities,
which provide sufficient conditions for the steerability of quantum states.
Here we discuss the converse problem, namely ensuring that a state is
unsteerable, and hence Bell local. We present a simple criterion, applicable to
any two-qubit state, which guarantees that the state admits a local hidden
state model for arbitrary projective measurements. We find new classes of
unsteerable entangled states, which can thus not violate any steering or Bell
inequality. In turn, this leads to sufficient conditions for a state to be only
one-way steerable, and provides the simplest possible example of one-way
steering. Finally, by exploiting the connection between steering and
measurement incompatibility, we give a sufficient criterion for a continuous
set of qubit measurements to be jointly measurable.
