Hello, why can't N7 19 make a phone call and send a short message after it is plugged into the telecom 4G card? But you can surf the Internet, 3G.

According to your description, it is recommended that you do the following:

1. Restart the phone to see if there is a signal problem.

2. On the standby screen, click Application-Settings-More Settings-Mobile Network-Network Mode-Select GSM Only.

3. Try to replace another SIM card.

4. I suggest you call the operator's customer service number to check whether the number of this SMS center in your area is correct.

5. Check whether the mobile phone is equipped with security guards or third-party SMS software, and test it after unloading.

6. Back up mobile phone data (phone book, SMS, multimedia files, etc.). ) and restore the factory settings.

If the above method still fails, please send the equipment to Samsung Service Center, and the engineer will check the machine and deal with it. Address and contact information of Samsung after-sales service center:.

If you have any comments, suggestions and comments, please click: support.samsung.com.cn/survey.