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SMS Recovery is not possible in Android. Once you delete a message, then the message is long gone without the possibility to recover it. Of course, there are backup and restore applications but those applications work when you perform a backup of the SMS messages and later you can restore them.
Follow the steps below to recover the deleted SMS from android phone. Have a try.

1 Connect your Android phone and enable USB debugging

2 Analyze your Android phone
After the USB debugging, reconnect your phone if you are asked to disconnect it during the setting. Then can see the window below. Here you need to bear in mind that your phone's battery is more than 20% charged, and then you can click "Start" to let the program analyze your Android phone.

3 Scan your Android for deleted text messages

4 Preview and recover messages from Android
You can preview the SMS that can find from it.

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Learn how to erase data before you sell or give away your iPhone, iPad, or iPod touch,including contacts,messages,videos,call history,bookmarks,sms and so on.
Before you sell or give away your iOS device, make sure that you've removed all of your personal information. Follow these steps to protect your data and get your device to its factory default state for the new owner:
Back up your device can delete your iPhone information on the surface.But the deleted data maybe appear again with other reason we don not know.

Important: Do not manually delete contacts, calendars, reminders, documents, photo streams, or any other iCloud data while signed in to your iCloud account, or the content will also be deleted from the iCloud servers and all of your iCloud devices.
So,we need to use The Professional third party tool to delete iPhone data permanently which named iPhone Data Eraser.
In order to avoid personal privacy is exposed, iPhone Data Eraser with 100% permanent erasure of Your idevice’s data, nothing recoverable.
IPhone Data Eraser can erase all data before you selling IOS device, only the data erase all to protect personal privacy, iPhone data has been the tool to erase can not use the recovery software for data recovery, all in the erase before the best data backup main.iOS Data Eraser delete data including contacts,messages,songs,videos,call history,etc.

Just several easy steps to delete data from iPhone before selling:
Step1 Run the iPhone data erase and connect iPhone to PC
Step2 Select Security Level and Start to Delete
Step3 Start to erase all data on your iPhone
Step4 Click “Done” and the wiping completed