Keep Contactin' - a simple address book application. It allows you to manage your contacts in the similar way the Microsoft Pocket Outlook does and also has advanced sorting functionality (sorting contacts by First/Last Name, Address, Phone Number and etc
V2R Pro Tone - With pro Tone installed you will hear immediately who is calling you from which phone.
Pro tone even allows you to set different volumes and profile rules for one contacts different phones.
Pro Tone comes with an outstanding and easy to use user interfaces
Export Contacts - Everyting can happen, so it’s better to have several backups of your contacts, not only in PC outlook. Or may be you’re using Linux and can’t sycnronize your WM5 device with PC