try and look in the manual for your modem, or if you don't have one, look your modem up on google, maybe the thing has options, and access to the modem, like for routers, you type in 192.168.2.1 or something along those lines into your browser, and then you have a bunch of options to choose from, dunno if your or any modem has this kind of thing but you never know.
I'm betting on it being the modem though, if all else fails phone Sprint up and tell them what your trying to do, and is there something in the modem that might be stopping it.
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