Why does my iphone 4s always say multiple calls when i place a call on hold?

If i'm on a call and get another call come thru on my old iphone 3gs it would say hold for the top caller and i can either merge the calls and swap from one another but with my current iphone 4s i click hold call + answer and right away it says multiple calls and i can't swap from one call to another the only thing i can't tell is if it places the calls on a three way? And if i'm done with the second caller i can't swap back to the first caller withour hanging up and calling again? I have service with sprint would this have something to do with it? Would any one know what the issue is? Any help would be appreciated thanks!

No idea

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