Apple's 5S version has a card sticker. When I wake up in the morning, I find that my mobile phone can't access the Internet, can't send short messages, and can even make wireless calls. What's going o

Apple's 5S version has a card sticker. When I wake up in the morning, I find that my mobile phone can't access the Internet, can't send short messages, and can even make wireless calls. What's going on here? First of all, I used the Japanese version with lock 6, which can get the perfect 4G card. I've never been disconnected from 4G (except for the signal and arrears), and I've been hung upside down many times.

This problem generally occurs because the operators who sell mobile phones to countries have modified their information, that is, what we call China Mobile custom machine, China Unicom and Telecom custom machine; American operators don't have our country's signal towers, so they have card stickers. As for the situation that the mobile phone can't get online and send short messages, the reason may be that there is something wrong with the card setting or the operator's update is delayed-choose "Yes"; Also, you upgraded your mobile phone system.

The problem is not big. Use this card to reset it. If not, change a card to reset. It's not the phone.

The card is not expensive, it looks like 40-60.

After setting it up, I don't want to use it but want to sell it. According to the current market price, 5s parallel imports (also related to the country) and two mobile phones are 90% new, which is probably below 1000 yuan.