Why can't Samsung s5 mobile phone activate the mobile 4g card?

Dear Samsung users:

According to your description, it is suggested that you try the operation according to the following steps:

1. Turn off the phone again and check whether the mobile phone card is inserted in place

2. Take out the SIM card and clean the metal contacts of the SIM card with rubber. (Is the sim card in poor contact?)

3. Try replacing a sim card (is the SIM card aging or damaged?)

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

If the problem still exists, I suggest you send the mobile phone to the nearest Samsung service center for inspection and maintenance. Please click the following link for the specific location of Samsung Service Center: .samsung.com/support/servicelocations.asp

We suggest that you apply for "booking to the store" in Samsung official website to enjoy priority maintenance service: /pre-booking

After the reservation is successful, please bring your machine, invoice and warranty card to visit the service center you reserved on time.

for comments, suggestions and comments, please click: support.samsung.com.cn/survey.