Smartphones

Material A
Various.

Appropriate disposal: recycling.

Recycling plants will pick apart at the set, to separate the recyclable and non-recyclable parts and therefore you save from landfill as much as you can. Most retail outlets will accept back their electronic waste and if not that, there are local community programs that collect E-waste.

Best Alternative
Even though an investment, look into buying a durable good smartphone that you will not find the need to replace for the next few years.