Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Verizon Samsung Alias 2 U750 No Contract Dual-Flip e-ink QWERTY Phone Black
Product description: The Samsung Alias 2 SCH-U750 is equipped with an e-ink keyboard that morphs between numeric, QWERTY, and other layouts. This update to the original Alias steps up to a 2 megapixel camera, a large QVGA display, and support for business email along with visual voicemail. Other key features include music player, video streaming, MMS messaging, 3G EVDO high-speed data, microSD slot for additional storage, and stereo Bluetooth compatibility.
Product feature: This product has been carefully audited and is certified to be 100% functional., This offer includes the following accessories 1. Battery 2. Battery Cover (if applicable) 3. Wall Charger
Product brand: Samsung
Target attributes: SIM Slots
Answer: attribute: sim slots
value: None
source: None