feature:
* if you want change the prefix of all list contacts in your device?
- Ex:
- transfer list contacts start with +84 like: +8411111, +8422222, +8433333, etc... to 03 like: 0311111, 0322222, 0333333, etc...
* If you have a new Smartphone, you want delete all contacts in your old device when you sales or give a someone, you can not handmade to delete every contact?
- use app to delete all contacts in your device is easy and fast with one touch
* Support for update many Type Contacts: MOBILE, HOME, WORK, etc...
Use for offline
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