The symbol of a coil (inductor) is just like a wave lines which emphasized that there is a winding component on that circuit which means that the coil is connected in there. In cellphone circuit many coil is being used in B+ voltage filtering to avoid saturated voltage and current.
coils are easy to identify in an schematic diagram for they are form into a wave line. It is labeled with letter "L" which means Inductance.
In cellphone circuit coils are also prone to be easily damaged like when it is being used in B+ line filtering. It will be blown out or end up busted if some short circuit occurs.
