Do any cell phone cos. let you BYO phone w/o contract?

[Chupa Chupa]

No regular post paid service. I did it with my Sony Ericsson P800 w/ T-mob back in '03. The phone was a Euro only phone, but I was in love with it and a local company had an unlocked one in stock for below street so I bit. T-Mob made me buy Sim card but didn't have to do a contract since they didn't subsidize the phone. That was way before the pay-go services became popular. The cell industry has changed a lot since them, which is why I'm asking.