Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: SAMSUNG SPH-M800 INSTINCT SPRINT CDMA NO CONTRACT
Product description: In original packaging. Includes 2 Standard Lithium Ion (Li-lon) Batteries, AC Phone Charger, Charger for Extra Battery, Carry Case with Stylus, 3.5mm Headphones with Microphone, MicroSD Memory Card 2GB (installed), MicroSD Card Adapter, USB Cable (Charging), Software Installation CD, Get Started Guide, Explore More Guide.
Product feature: TOUCH SCREEN, GPS
Product brand: Samsung
Target attributes: Operating System
Answer: attribute: operating system
value: None
source: None