Mobile phone has a signal abroad Why is there no signal when you return home?

If there is no signal on your phone or an emergency call prompt is displayed on the screen, it is recommended:

2.If it is a dual-SIM phone, please check whether the SIM card is activated: Settings - SIM Manager - SIM1 SIM2 - Click the SIM card icon - slide to turn on (the operation mode may be slightly different for different models of mobile phones).

3.If there is still no signal, it is recommended to turn off the SIM card and remove it, wipe the SIM card chip with an eraser, and then reinstall it.

4.If it doesn't work, try to change to another location to rule out whether it is caused by poor signal coverage in your location.

5.Try to change the network mode to 3G or 2G (do not select the auto-connect mode). Note: Some machines do not support changing the network mode.

6.Try to change another SIM card.

7.Update your phone's system version: Settings - About Phone (About Device) - Manual Update Automatic Update (Software Update System Update - Update). Note: Please back up the data (contacts, messages, **, etc.) in your device before upgrading.

If there is still no signal or emergency call is displayed after the above operations, please bring the purchase invoice, warranty card and machine to the nearest service center for inspection.

The reasons why the SIM card cannot be used are as follows:

1. The contact between the metal contacts of the mobile phone card and the mobile phone is insufficient;

2. The mobile phone card is damaged;

3. Whether the location is a signal blind area or suddenly no signal.

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1. The nearby signal is not good.

Ask someone nearby to determine if the signal quality is poor in the neighborhood. This is also not uncommon, both in cities and in mountainous areas. If the situation is more serious, it is recommended to contact the operator for a solution.

Second, the signal is blocked.

In some large exams or near the security center, there is a signal blocking device, and if the mobile phone arrives here, no matter how good the performance is, there will be no signal. Please see if there is such a shielding device nearby.

3. Whether a metal mobile phone shell is used.

In fact, many mobile phone shells sold now are plastic, silicone this insulating substance, this is no problem, but there are also people who usually have a high damage index, in order to avoid the mobile phone from breaking, the use of that thick shell, the gold celery cavity shell causes serious interference and shielding of wireless signals.

Fourth, the mobile phone is temporarily malfunctioning.

This happens from time to time, and it can be more frequent when your phone is not performing well. Turn airplane mode on and off or turn it off, or turn it off and restart.

5. Mobile phone performance problems.

Some mobile phones have signal problems by themselves, and it is recommended not to buy such phones as much as possible.

The mobile phone cannot receive calls normally**Causes and solutions:

1. Check whether the phone is set to call forwarding and turn on airplane mode.

call restrictions, etc., it is recommended to cancel and try again;

2. In a remote or closed location with a weak signal, you can try to change the location of the imitation source rock to receive the call**;

3. The new number needs to be activated before it can be used normally, and the status of the local number can be queried;

Fourth, the number is in a state of shutdown affecting the call**, you can query the number information to understand the status of the number, if it is abnormal, you need to restore the normal state of the number before calling**;

5. Please check whether there is any arrears on the mobile phone, if you have recharged, you can check the recharge to the account;

6. Please check whether the mobile phone card is damaged or not inserted properly, and you can go to the local business hall for testing or replacement of the mobile phone card crack;

7. It is recommended that you restart or switch off the airplane mode and try again. If you still can't make a call**, you can also change your phone for a backup test.

If you have any questions, click here. Consultation.

If you use an iPhone after leaving the country, you may not be able to search for the local network operator after the phone is turned on. This is because the network standard may be different due to different carriers, resulting in unstable signals.

Solution: 1. Turn on the phone's settings.

2. Tap to turn on the airplane mode of your phone.

3. At this time, the upper left corner of the mobile phone displays the "airplane" icon, and the mobile phone is in the state of holding the brother calendar without network, and the airplane mode is turned on to refresh the network.

4. Tap Airplane mode again to turn off Airplane mode. In this case, after the network is refreshed, the network can be restored to normal.

What should I do if my mobile phone opens up international roaming but there is no service after leaving the country?

What should I do if my mobile phone has opened inter-band roaming and has services in China, but there is no signal after going abroad?

Turn on step-by-step reading mode. How it works:

There are three scenarios. First, the phone bill is owed. Please make sure you have enough credit balance before you leave the country. If the service is interrupted due to arrears, we can renew the service and activate the service through various methods such as ** recharge.

The second is that there is a problem with the card slot of the mobile phone. In order to confirm that the mobile phone card slot is faulty, we can try to change to a mobile phone card with sufficient balance and strong signal. If there is still no service, it is likely that the phone itself is a problem, and we will have to repair the old phone or replace it with a new one.

If there is a service, it is that there is a problem with the SIM card itself.

The third is the problem of mobile phone card. There are two types of mobile phone card problems. First, the mobile phone card is stuck when searching for signals and cannot be automatically connected.

We need to call the carrier and ask the customer service to help us reactivate the SIM card. If there is still no service, it may be the second situation, that is, the mobile phone card itself has a weak ability to receive signals.

In most cases, we will not replace the mobile phone card for a long time, in the context of the acceleration of mobile phone card upgrading, it is difficult to find the signal with the old mobile phone card in some places with poor telecommunication infrastructure abroad. We can only use the last big move: change the SIM card.

We can only. Replace the SIM card in the country. Come to any local business hall, explain your intention to the staff of Mingdulu, they will take you to a machine, enter the mobile phone number, receive the verification code, enter the verification code, and in less than 5 minutes, the staff will update the mobile phone card for you.

Plug in the new version of the mobile phone card, and the above problems are solved.

The author is based abroad, after trying various methods to no avail, endured half a year of international roaming mobile phone number without service, returned to China to replace the mobile phone card, and found that the problem was successfully solved after going abroad again. It is recommended that you remember to replace your mobile phone card every 2-3 years when you buy a new mobile phone to enjoy more comprehensive and thoughtful services.

Hello dear There may be no signal for the mobile phone card when you return to China for the following reasons:1Different countries and regions have different communication standards, and the mobile phone card returning to China may not be able to adapt to the local Tongda Rock tokenization standard, resulting in inability to use.

2.If the mobile phone card is in arrears or has been shut down, you need to recharge it in time or contact the local operator to deal with it. 3.

The SIM card is set with international roaming restrictions, and you need to contact your local carrier to lift the restrictions. 4.If the SIM card is damaged or expired, you need to replace it with a new one.

If none of the above methods can solve the problem, it is recommended that you contact the local carrier's customer service for help to solve the signal problem. 

Summary. Hello, then you have to rule out whether it is a mobile terminal problem. Due to the different frequencies of network use in Taiwan, Hong Kong, Macao and overseas operators, when the user's mobile phone frequency does not support the frequency of the country or region to which the user is going, the user will not be able to use the mobile phone communication in Taiwan, Hong Kong, Macao and overseas.

The second step is to rule out the SIM card issue. It is recommended to wipe your SIM card clean and put it on other mobile phones that can be used normally to test whether the SIM card can be read normally.

The third step is to confirm whether you have actually enabled the international roaming and international long-distance function. Take China Unicom APP as an example, click on the service in the mobile phone business hall, click on the handle, click on the switch on the long-distance service, and click on the roaming service, you can check the current status is that the call fee has been opened.

The fourth step is to manually select the network to turn on the cellular data. When used in China, it will default to 4G after leaving the country or in the region, and if the 4G signal is weak or there is no coverage, try to adjust it to 3G, 2G to take a look.

What should I do if my mobile phone goes abroad to install a foreign card and there is no signal?

Hello, then you have to rule out whether it is a mobile phone terminal problem. Due to the different frequencies used by the networks of Taiwan, Hong Kong, Macao and overseas operators, when the user's mobile phone frequency does not support the frequency of the country or region to which he is visiting, the user will not be able to use the mobile phone communication in Taiwan, Hong Kong, Macao and abroad. The second step is to rule out the SIM card issue.

It is recommended to wipe your SIM card clean, put it on other mobile phones that can be used normally, and test whether the SIM card can be read normally in medium and high temperatures. The third step is to confirm whether you have actually enabled the international roaming and international long-distance function. Take China Unicom APP as an example, click on the service in the mobile phone business hall, click on the handle, click on the switch on the long-distance service, and click on the roaming service, you can check the current status is that the call fee has been opened.

The fourth step is to manually select the network to turn on the cellular data. When used in China, it will default to 4G after leaving the country or in the region, and if the 4G signal is weak or there is no coverage, try to adjust it to 3G, 2G to take a look.

Mine is a vivo phone, and the local card installed in Mexico abroad sometimes suddenly disappears? Only call Emergency**!

You have to check whether the country or land area you are visiting supports international roaming of this number, if not, it will not be available. It is recommended to set this network to a manual search and try to change to another network as soon as possible. If you can't solve the problem, you can dial these numbers from a local fixed** or local mobile phone to get help from a dedicated customer service agent in the roaming area in a timely manner, and you will not have to pay for international roaming and international long distance charges.