Sprint Offer $400 Store Credit

Sprint (S) has long been plugging its unlimited data plans as a key benefit for users who are fed up with paying overage fees from Verizon (VZ) and AT&T (T), but now the company is adding cold, hard cash to the equation as well. PhoneArena spotted a Sprint promo that is offering people a $400 in-store credit if they switch three or more of their wireless phone lines to Sprint from another carrier. The offer will reportedly be available in all Sprint stores from August 19th through September 15th, and will require users to sign a two-year service agreement.