  Recently a $f(T)$ gravity based on the modification of the teleparallel
gravity was proposed to explain the accelerated expansion of the universe
without the need of dark energy. We use observational data from Type Ia
Supernovae, Baryon Acoustic Oscillations, and Cosmic Microwave Background to
constrain this $f(T)$ theory and reconstruct the effective equation of state
and the deceleration parameter. We obtain the best-fit values of parameters and
find an interesting result that the $f(T)$ theory considered here allows for
the accelerated Hubble expansion to be a transient effect.
