It depends on the rate plan.  If you are six months into a plan with a 2
year agreement and change to a plan with a 1 year agreement, you do not
renew your agreement, you ride it out.  If you are on a 1 year agreement and
change to a plan with a 2 year, you pick up a new agreement.  The only time
you renew your agreement is if the new rate plan has the same terms as the
one it is replacing.