could not activate cellular data network

I just bought an iphone 3gs on ebay and can make calls through my carrier but can't get a data connection through it. It gives me the "could not activate cellular data network, you are not subscribed to a data service". My service provider, Sasktel says I have a data plan connected to this phone. They told me to contact apple for support. The phone was on ATT before and I unlocked it myself. I have reset the network, rebooted, entered the cellular data network info myself, used the...

could not activate cellular data network

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