The phone will automatically hang up when calling in the dormitory. If others can't get in, you can send text messages online.

If the phone is disconnected during a call, it is recommended that:

1. Check whether the cell phone signal is stable. If the signal is unstable or weak, it will affect the normal call of the mobile phone. It is recommended to restart the machine to search for the signal again or try to change to another location.

2. Check whether every phone has this situation, and rule out whether it is the other party's phone.

3. If the call is interrupted frequently, it is recommended to take out the SIM card and try to insert it again.

4. Replace other SIM cards to see if the same problem occurs.

5. If not, try to update the mobile phone system version: Settings-About the mobile phone (about the device)-Download the update manually/download the update automatically (software update/system update-update). Note: Please back up the data in the device before upgrading.

If the problem still exists, it is recommended that you take the purchase invoice and three-guarantee certificate to the nearest after-sales service center for testing.

If the phone can't receive the other party's call, but you can make a call, I suggest you:

1. Take out the SIM card and insert it again.

2. Try to change the position.

3. Check whether the blacklist (call rejection) function is set on the mobile phone. If so, please cancel the post-test.

4. Check whether the call forwarding/call barring function is set on the machine.

5. If there is software for installing security guards in the mobile phone, it is recommended to uninstall and delete it.

6. If it is invalid, back up the data (contacts, text messages, pictures, etc. ) in the phone, and then restore the 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.