1)Purchase of mobile is fixed asset so purchase of mobile should be capitalized..
2)As per companies act rate of depreciation on Assets Whose actual cost does not exceed Rs.5000 shall be 100%
3)So by doing as above in Fixed Asset register it will shows as Addition of fixed asset and as the actual cost was less than Rs.5000 you have depreciated at rate of 100% so value of asset at the end of year was Rs.zero