Well, AT&T spent an average of $35 billion a year on their network from 2014-2018. If you assume the cost of a launched satellite is $1 billion, that is 35 satellites per year. I believe the actual cost is as little as a third of that for traditional satellites, maybe less with SpaceX, so ~105 per year. If you are talking about LEO satellites, SpaceX just launched 60 on a single rocket, so potentially far cheaper than traditional satellites.
Are you including the costs of the support structure and personnel needed for those satellites? And those 60 SpaceX satellites are single purpose limited life designs that are in no way suited to DBS use.