Hello @6441978ja!
In this day and age, it’s gotten to the point where sometimes the phone’s contents are worth more than the actual phone, and we know how important this is to you. Pictures, video, text messages and contacts are some of the things that people sometimes value even more than their phone. I can help you set your contacts up in a way that (hopefully not) if they get deleted again you can quickly restore them.
Do you know if you’re contacts are set to sync with any service, such as Google Contacts or AT&T Address Book? It’s possible that when you’re editing the contact information, the cloud service where your contacts are stored is set to sync automatically is re-writing any changes you make. Information on how to disable auto-sync AT&T Address Book is available from our website.
If the issue persists we’ll be more than happy to perform additional troubleshooting with you. Please reply to our posts if you continue to have issues with your contacts!
We look forward to working with you to resolve your issue!
Diego, Community Specialist