Change Prefix Number is a free utility tool developed by L.H.C for Android devices. This program allows the user to edit the prefix of their phone numbers in their contact list. For instance, if a user wants to add a prefix of +84 to their mobile phone number, they can use this app to get +.

The app is easy to use and can be installed from the Google Play Store. However, if the user has a large contact list, they may need to wait for a few minutes for the update to complete. The user should also recheck their contact list after the update to ensure that it was successful. It is important to note that in some cases, the update may fail, but the contacts will still be updated successfully.

Overall, Change Prefix Number is a useful tool for those who need to edit the prefix of their phone numbers in their contact list.