1) Receiving duplicate text messages on iphone 10S. How to eliminate? 2) how to sync iphone with other ios devices? Newbu thanks you in advance to all responders!
1. What you're dealing with is actually duplicate notifications for Messages. The text itself isn't replicated in the chat history, but the notifications are repeated.
To fix this, open the Settings app and go to: Notifications > Messages > Repeat Alerts.
Once you're there, set Repeat Alerts to Never.
Otherwise, you can hide alerts for specific chats within the Messages app.
2. If you'd like your data to be synced across your Apple devices, you'll need to set up iCloud.
Refer to this guide in order to fulfill your request.