Hi,
What do u mean by description and working?
Usually mobile phone antenna are designed to work isotropically i.e. radiate in all direction. Beside this property, there are other antenna design parameters like shape, size, antenna efficiency, bandwidth, etc are considered. Recently, specific absorption rate(SAR) is also another important parameter to be paid attention, which is a measure how much mobile phone radiation is absorbed inside human head.
And nowadays, there are many antenna types used for mobile phone, mostly monopole, helical, patch, PIFA, etc.
Hope, of any help!