Previously detectives as well as cops were able to get details of a landline number, since almost all the landline numbers are incorporated in government directories, online or yellow pages. But when it came to mobile numbers then the question that whose phone number is this often arose in their minds since particulars about a mobile number cannot be availed that easily. Now with the latest reverse phone lookup service even information about mobile numbers are also easily accessible.Whose telephone number is this? So whether it is a landline number or a mobile number, no detectives and cops can work at ease.