Is my iphone 4s unlocked to all networks?

Is my iphone 4s unlocked to all networks?
When i go into Settings > carrier and turn automatic off, i get a screen with a list of networks, eg o2 uk, vodafone uk, three uk, orange.currently i have a vodafone sim card in the iphone on pay as you go, but i need to change it to a three sim card on contract.
By the way i'm running ios 6.1 if thats any help.

If you bought it with a contract its locked if not its unlocked.

To find is locked Or not insert other network sim. What you See in settings is only the carrier available in your area.

All the best.

If it works with other sim cards inserted into the phone it is unlocked

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