The formal unveiling of LG's Viper this morning may not have piqued your interest, but Sprint loyalists hellbent on maintaining access to an unlimited plan may want to take a second look. Initially pointed out by TechHog, and confirmed to us today by a Sprint spokesperson, the carrier's impending LTE data network will indeed be included on its existing Everything plans. In other words, the Viper -- as well as any other LTE smartphone, Galaxy Nexus included -- will be able to surf the LTE superhighway without limits. To date, the "unlimited" nature of Sprint