Samsung mobile phone is often disconnected from the network, the network is unavailable, and the id is not applicable.

If you disconnect when using mobile data to surf the Internet for no reason, it is suggested that:

1. Turn off the phone and restart it.

2. If it is Unicom WCDMA mobile phone, it is recommended to change the network mode. Operation: Settings-More Settings (More Networks)-Mobile Network-Network Mode-Select "GSM Only/GSM Only".

3. Please check whether the mobile data restriction function is set. Mode: Settings-Data Usage-Set Mobile Data Limit-Uncheck.

4. Try changing the time period.

5. replace the SIM card.

6. Please back up the data (contacts, text messages, pictures, etc. ), and then restore the factory settings (Settings-Reset/Privacy/Personal-Restore Factory Settings).

If the problem still exists, please take the purchase invoice, maintenance card and machine to the Samsung service center, and the professional after-sales engineer will help you test it.