Recently, I suddenly can't send and receive text messages and make phone calls in America.

If you can't use the international communication function normally in a foreign country, you can confirm the following points:

Whether it is 1. Insufficient contact between SIM card and metal contact of mobile phone;

2. Whether it is 2. SIM card is damaged;

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

Tips: I suggest you put your mobile phone card in another mobile phone to test it. If this situation still occurs, I suggest you bring your mobile phone card to the business hall for testing and replacement.

If you have enabled the international roaming function, but you can't use it when roaming internationally, there may be the following reasons:

1. Some countries have different network standards and frequency bands, so it is necessary to replace appropriate mobile terminals to use the international roaming function;

2. The mobile phone is set to automatically select the network, and no operator can be found to cooperate with our company. You can manually select a network by changing the setting to "Select Network Manually".

If the above problems can't be solved, you can call the international roaming customer service hotline+8618618610010 for free service feedback (free only when using Unicom mobile phone).

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