Why do group texting display illegal mobile phone numbers?

It may be caused by a large number of group texting.

Because the country has been cracking down on spam messages, a mobile phone number will be banned if it is sent too much.

Take Android phones as an example. How to deal with the problem that Android phones can't send short messages in groups: First, make sure that the contact number chosen by zd is a normal phone number, and check whether it contains special characters, email addresses, etc. Second, it is recommended not to send too many contacts at once. Third, set-in-application-information-clear data and cache to remind you to back up important short messages. Fourth, download information group software tried to send text messages in groups. Five, change the machine and change the card test, contact the location of the card problem, restore the backup data of the mobile phone problem from the manufacturer or contact the after-sales treatment.