SMS can't be sent out after iphone upgrade.

If the SMS cannot be sent out after the upgrade of the landlord's Apple mobile phone, it is suggested that the landlord enter the mobile phone to find the SMS settings. Then check whether the number of the SMS center is correct and whether the parameters related to SMS are set correctly. If you are sure there is no problem, you can restart your phone and try again. If it still doesn't work, you can try to restore the network parameters of the mobile phone and see if it can be solved.