Contacts Backup Kit - Contacts Backup Kit is an app by ETO that contains features so you can easily import all the phone numbers in your phonebook between the available devices when you change your smartphone.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Contacts Backup and Restore Contact - Contacts Backup and Restore Contact app enable users to get back all their lost and deleted phone numbers by restoring the available backup file with a single tap.
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
SA Contacts Lite - SA Contacts Lite app comes up with features to help you in transferring all your contacts in your phone book between all your handheld devices without much of a stretch.
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.