Can you expand on why it costs so much to upgrade a basestation? the fiber is already rolled out, the contracts between land owners have already been signed, the surveys for radio propagation have already been done. I honestly don't think the upgrade from 3g to LTE was nearly as expensive as the upgrade from EDGE/2g networks to 3g was for carriers. Also it was much, much quicker for them to roll out LTE networks vs 3g networks.