Mobile phones can't connect data to the Internet. They can only use wifi. They can't send short messages, but they can make and receive calls.

If the mobile phone can't surf the Internet normally, troubleshooting can be carried out according to the following conditions:

Situation 1, the contact between the SIM card and the metal contact of the mobile phone is insufficient. Try to insert the SIM card again.

In case 2, if the SIM card is damaged or the mobile phone has a problem, you can change the machine to check to see if there is a problem with the SIM card or the mobile phone.

In case 3, the current position is a signal blind area or there is no signal suddenly. You can test it in another place and pay attention to whether the cell phone signals of other users around you are normal.

Case 4: If the mobile phone card is in arrears, you can pay the arrears and start the mobile phone.

In case 5, the service is suspended due to abnormal number use, such as the number being used for illegal or illegal activities.

In the sixth case, roaming in Taiwan, Hong Kong and Macao or roaming abroad can only be used after roaming in Taiwan, Hong Kong and Macao and international roaming are enabled.

Situation 7: When the total traffic generated by surfing the Internet in the current month reaches the package traffic capping value, the system will automatically turn off the Internet access function, or the speed-limiting network will automatically resume opening next month, depending on the traffic capping rules of your package.

The processing method that the mobile phone cannot send short messages is as follows:

Method 1: You can change your mobile phone and see if you can send and receive short messages.

Method 2: If you can send and receive short messages, I suggest you plug the card back into your mobile phone and send yourself a short message to see if you can receive it.

Method 3 If not, I suggest you check whether there is a problem with the sim card;

Method 4: Check whether the number of SMS center is set correctly;

Method 5: Take the mobile phone card to the local business hall for testing or replacement.