I have a iphone but i want to know if its unlocked?

When i go to settings than carrier in the phone it shows both at&t and tmobile, does that mean its unlocked?

The Apple Network & Lock Info Service can be used to find the current Network and the Lock status of any Apple Device. To find the current Network and the Lock status of your mobile phone using the Apple Network & Lock Info Service, you need to provide with the following information:
*Your mobile phone manufacturer name and model number
*The name of the network or service provider you think your mobile phone is currently locked to
*The IMEI Number of your mobile phone
You can get this Apple Network & Lock Info Service from http://www.prounlocking.com/apple-network-lock-info-service/rs8wp10/ All the best mate.

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