Well, image that a single device like a cellphone, it offers mobile connectivity it needs a place to insert a SIM card, and this one is very suitable indeed.
Hardwares are designed to be smaller to save space, like fpc, compared with before, thinner and more freely bending. actually more and more electronic parts becoming very tiny and delicate.
In addition to phone circuits, we, at the meantime, find fpc in hard disk drive which collects the electronmagnetic, helping electronmagnetic transmisson.(http://product.xindabest.com