What's the matter that Apple's mobile phone can't receive information when it changes its telecom card?

Any ordinary user can receive it. If you can send and receive short messages, it is suggested to plug the card back into your mobile phone and send yourself a short message to see if you can receive it. It is recommended to check whether it is a problem with the sim card. Then check whether the number of SMS center is set correctly.

2. It is recommended to take the mobile phone card to the local business hall for testing or replacement.

Some non-bank Apple phones do not support telecom cards to make calls and send and receive short messages, and such problems usually appear on Hong Kong version of Apple phones.

China Telecom's network system is quite special. Its 2G and 3G networks are based on CDMA, while its 4G network is based on FDD-LTE. China Telecom's 2G and 3G networks are not supported because there is no CDMA network in Hong Kong and the Hong Kong version of Apple's mobile phone has no built-in CDMA baseband.