They did also sell X.25 (not circuit switched), but generally it was not competitive form a price/performance perspective with an IP network built from T-1s. P

They did also sell X.25 (not circuit switched), but generally it was not competitive form a price/performance perspective with an IP network built from T-1s. People wanted packet switched service, but found it was cheaper/better to build it themselves as an overlay network from circuits leased form the telcos.