Why can't the contacts on the mobile phone card be deleted?

If the contacts on the mobile phone card can't be deleted, it's usually because the mobile phone card is dead. You can back up the data first, then restore the phone to the factory settings, and then delete the contacts.

When the mobile phone is used for a long time, sometimes it will get stuck or the memory space is insufficient, or even crash. At this time, you need to restore the factory settings and restore the mobile phone to its original inactive state, so that you can continue to use the mobile phone.

So does restoring factory settings have an impact on mobile phones? The answer is that it will not have any impact on the mobile phone, but it will have an impact on the content and software stored in the mobile phone. After all, restoring the factory settings will erase all the data on the mobile phone.

So before you use the factory settings, the data in your mobile phone should be backed up, especially the address book and some important files at work. In addition, restoring the factory settings will also reduce the version of the software that comes with the phone. It takes time to manually update software and download some commonly used software and games.

Does it affect the mobile phone after restoring the factory settings? I believe many people want to know this question, especially those who often use factory reset. The answer is that restoring the factory settings will not have any impact on the mobile phone, but it will have an impact on the content and software stored in the mobile phone.

As we all know, using this function when the mobile phone is stuck or the memory is insufficient will cause all the contents stored in the mobile phone to be lost, including stored photos, numbers, text messages, software and so on. And it is irreparable. In this way, the memory of the mobile phone will be improved a lot, and it will be smoother to use, but the playback speed is not as fast as that of the new mobile phone. After all, mobile phones are used for a long time, and some accessories will still wear out.

Before you use the factory settings, everything in your mobile phone should be backed up in advance, and all the mobile phone numbers and some important files should be exported for backup, and then the factory settings should be restored. In fact, this function will also make the software version that comes with your mobile phone lower. Then you need to spend more time updating the software manually and downloading some commonly used software.

Although restoring the factory settings of the mobile phone will not have any impact on the mobile phone, it takes time to restore the factory settings every time. If the phone is stuck frequently and the memory is insufficient, it is better to change the phone. Even if the phone is restored to factory settings, it won't take long to change the card, so it doesn't take time.