I'm going to go ahead and throw up a red flag. I don't think this is a Sprint owned domain. I think it's meant to LOOK like one, but I don't think it IS one.
$ dig +short sprint.net ns
ns1-auth.sprintlink.net.
ns2-auth.sprintlink.net.
ns3-auth.sprintlink.net.
$ dig +short sprint.com ns
reston-ns1.telemail.net.
ns2-auth.sprintlink.net.
reston-ns3.telemail.net.
reston-ns2.telemail.net.
ns1-auth.sprintlink.net.
ns3-auth.sprintlink.net.
The places Sprint hosts their "well-known" domains looks remarkably like it's a legitimate place. "wabaw.net", however?
$ dig +short wabaw.net ns
ns6.domainmonger.com.
ns5.domainmonger.com.
ns7.domainmonger.com.
ns8.domainmonger.com.
I'm going to propose a theory that the WHOIS data shows Sprint so that - if someone gets caught and folks go looking for someone to vilify, Sprint is the unwitting victim. But - in reality - it's sitting in some domain-registration that nobody official at Sprint has ever heard of, and someone's been building a network of phones that they control via MDM.