A method for assembling a communication device and the communication device The communication device includes a casing that houses a battery. The battery extends in a main extension plane. The casing includes a back cover to cover the battery, and the back cover extends in a second plane substantially parallel to the main extension plane. The communication device also has an electrical signal transmission line having a first portion and a second portion. The second portion is coupled to a processor of the communication device. The first portion has a longitudinal extension coupled to at least one electrical component, wherein the first portion extends alongside the battery in a third plane substantially perpendicular to the main extension plane.