Sprint Nextel will be taking on the iPhone with a lower price for its own touchscreen smartphone, the Samsung Instinct. The carrier said Wednesday that the Instinct will cost $129.99 when released on Friday. That compares with $199 for the cheapest model of the new iPhone, which goes on sale July 11 with AT&T as the carrier. The Instinct shares many features with the new iPhone, including access to a fast wireless data network and a GPS receiver. Sprint was unusually involved in the phone’s development, and plans to promote it heavily.