·AT&T DSL Service
That sonic.net hasn't gone out of business yet is a testament to their cleverness.
They are not line sharing, they are ATT resellers.
They handle the customer service and billing and manage trouble calls, but I talked to them about my ATT circuit.
They can't get me anything ATT won't give me.
ATT will not bond pairs even though all their equipment supports it. They won't support ADSL2+ even though all their equipment (and mine) supports it. I demanded they bond pairs to get my speed up and they refused.
The won't do anything that requires them to lift a finger. As long as you pay them without them having to exert themselves they are willing to take your money. If you don't like what you are getting from them they suggest you might be happier with another provider. They actually suggested that to me. They have no competition and they know it. They can do better but they refuse to do so.
ATT is a third rate company and we badly need the Justice department to break them up again.
Remember that ATT divestiture?
Well, here we are 30 years later, they are all back together again. It was a 30 year plan! It worked perfectly and no one is the wiser. Certainly everyone at the Justice Department that had to do with that is long retired, just like was planned.