This simple tool will only read and shows phone numbers errors like:
- double entry
- wrong formatted phone numbers

Simple and Free at 100%!
- No addons
- No Ads
- No collected data

If you need more functionality, just write it in the comments or over the webpage.

This app can only read the contact info and will never edit/modify them. If you want modify a contact, the app will use your standard contact-app*.

* Known issues:
- On the standard Contacts-App you can't see the birthday of your outlook contacts
- If you edit an outlook contact, it disappears for some hours, until outlook re-syncs it again