Ultimate Samsung GS9 Smartcases and Leather Wallet Smartcases. All Smartcases and Leather Wallet Smartcases include an embedded EnviroSensor. Protect your Samsung Galaxy S9 with a slim, durable phone case, or purchase a luxurious USA Nappa leather wallet. Add more battery, more storage, more sensors, more . . . by adding one or more Smartblades to your purchase.