  We show that the only symmetries of the 2phi1 within a large class of
possible transformations are Heine's transformations. The class of
transformations considered consists of equation of the form 2phi1(a,b;c;q,z)=
f(a,b,c,z) 2phi1(L(a,b,c,q,z)), where f is a q-hypergeometric term and L a
linear operator on the logarithms of the parameters. We moreover prove some
results on q-difference equations satisfied by 2phi1, which are used to prove
the main result.
