What should I do if I don t have a network after changing my card, and what is the reason why I can

1 First of all, you need to make sure that the carrier has opened all the services of the SIM card for you. After replacing the card, many services need to be confirmed and activated before they can be used normally.

2 Secondly, you need to make sure that your mobile device supports 4G networks. Many mobile phones cannot support 4G networks, and even if they change to a 4G card, they will only display 3G or lower network standards.

3 If the phone can support 4G network, then see if there is a 4G network switch option. For example, the Apple phone will have a switch option for the 4G network, check to see if it is turned on.

4 If you have done all of the above and confirmed that there is no problem, you can restart your phone and wait for the network search to finish.

5 If you still don't have 4G, then you need to confirm whether the signal in your location is not good and you can't find the 4G network signal.

1.When the display detects that there is a card but no signal. The signal bar will make a difference.

2.You can click the menu to enter the settings. 3.

5.Click to go to the network operator. 6.

8.If none of the above fails, it is recommended to take the phone to the operator to help deal with it.

We recommend that you follow the steps below to see what caused it and resolve it:

1. Take out the card and reload it to see if there is a signal, if it still doesn't work, try to install the card on another mobile phone to see if it can be used, or change a card to load it into a 4S mobile phone, the above methods can see if there is a problem with the card and the card slot. If the card is broken, you need to go to the business hall to change the card, and the card slot is broken and needs to be repaired

2. If there is no signal caused by network delay, you can turn on the airplane mode of the mobile phone and turn it off after five seconds.

3. The signal in the place is not good and cannot be connected to the signal, so you can connect it again in another place.

4. The standard of the card is different from the network standard supported by the mobile phone, such as the mobile customized iPhone can not use the telecom card, it is recommended to change the card.

1. Check whether the signal is normal;

2. Whether the number card is in arrears;

3. Whether the data Internet function is turned on;

4. If the above 3 items are normal, you can re-switch on and off, change the machine and change the card test;

If your phone cannot access the Internet through mobile data, it is recommended to do the following:

1.Slide down the top curtain of the screen to turn on mobile data, and the SIM card needs to be activated for Internet service.

3.Try a different SIM card or a different time period to troubleshoot network issues.

4.Upgrade your phone to the latest version.

5.If it doesn't work, please back up the data in your phone and restore the machine to factory settings.

If the problem persists, please bring the purchase invoice, repair card and machine to the mobile service center for inspection.

The hand reading branch machine can not be connected to the Internet through mobile data, Samsung mobile phones are generally recommended to do the following:

1.Slide down the top curtain of the screen to turn on the mobile data switch. 【Tips】The SIM card needs to be activated for Internet service.

3.Try a different SIM card or a different time period to troubleshoot network issues.

4.Upgrade your phone to the latest version.

5.If it doesn't work, please back up the data in your phone and restore the machine to factory settings.

If the problem persists, please bring the purchase invoice, repair card and machine to the service center for inspection.

Samsung Service Center Address Information Customer Service**, you can inquire through the following methods: please log in to Samsung's official website - click on the upper right corner of after-sales service - click to find Samsung Service Center - select the product you want to inquire about and the province and city where you are located to search.

According to your description, not reading the SIM card, it is recommended that you try it by following the steps below:

1.Re-turn on the silver dust to turn off the phone, and check whether the mobile phone card is inserted in place and correctly.

2.Take out the SIM and clean the SIM card metal contacts with an eraser. (Whether it is a SIM card with poor contact).

3.Try to replace a SIM card (whether the SIM card is aged or damaged)4Back up your phone's data (book, SMS, multiple files, etc.) and restore factory settings.

If the problem persists, it is recommended that you send your phone to the nearest Frontier Samsung service center for inspection and repair.