The choke coil must have low direct resistance since a large current flows through it.
In particular, a 1 A or more current flows through a GSM. Thus, a winding type coil of large rated current is suitable.
Winding
Multilayer
A multi-layer type coil is generally used.
A thin film type coil is suitable if tight inductance tolerance is required.
Multilayer
Film

Application Examples of Cellular Phone