Make sure you can return the phone if you’re not happy with it. Some stores attach stiff order-cancellation fees on top of what an online company might charge. Also check for buyback or exchange schemes to get a higher cost of the old returned phones.
Most cell phones contain precious metals and plastics that can be recycled to save energy and resources that would otherwise be required to mine or manufacture. The circuit board on cell phones can be made of copper, gold, lead, zinc, beryllium, tantalum, coltan and other raw materials that require significant resources to mine and manufacture. When placed in a landfill, these materials can pollute the air and contaminate soil and drinking water. Cell phone coatings are typically made of lead, which is a toxic chemical that can result in adverse health effects when exposed to it in high levels. This is why it is important to recycle old cell phones. (Source: Wikipedia)