TrueCaller is a windows mobile software which can showing who the caller is when receiving a call through a number that is not saved in contacts.

With TrueCaller you can also make manual reverse number lookups in more than 25 countries by entering the phone number.
You can also save the contact to your phonebook and see the location on a map.

To run this apps you will need .Net Framework 2.0 installed on your system, you can download it here: .NET Compact Framework 3.5 Redistributable

Download
TrueCaller 1.30