What's the matter that telecom 4 g card can't send and receive information when installed on 3g mobile phone?

Telecom 4g card installed on telecom 3g mobile phone can't send and receive short messages, which should be caused by the short message error of mobile phone center number.

Generally speaking, after the mobile phone card is inserted into the mobile phone, the mobile phone will automatically set the number of the SMS center according to the situation of the mobile phone card, so that the SMS function can be used normally. If you insert a mobile phone card, the number of the relevant SMS center is wrong, which will make it impossible to send and receive SMS. At this time, you can consult the number of the local telecom short message center through the telecom customer service, then click the menu button of the short message interface to enter the setting center, select the short message center number option, and modify it manually.