It could be a provider that is available to roam on if Virgin Mobile is not available in that area you're in. Even if you can't roam on that provider, it might still be listed if it is picking up the signal.

I had a cell phone that picked up another network but it didn't allow me to use it, it was just listed on there.

hey guys, i've noticed when i put my virgin mobile sim card into my Samsung Galaxy S, i get the option to choose either a Virgin Mobile service or a Optus service. can anyone tell me why i get the option to choose, thanks