iPhone 4… “Tough Extreme” ..this is a military grade case with maximum protection. offers screen protection, as well as full side and back protection.
http://www.derekdeyoung.com/store/i-phone-4-cases-tough-extreme

Samsung Galaxy S4…”Tough” …This is a slim case that offers great frontal protection.
http://www.derekdeyoung.com/store/samsung-galaxy-s4-cases-tough