Hi,
Check what it shown in the SMS Message Centre setting in your phone.
To check the setting in your phone tap on ''Messages > more options > settings ''and locate the option for ''Message Centre''. Tap to enter to change the information.
As each mobile phone service provider has a different setting (it is usually a phone number or a code number) you will need find what is the correct information that has to be inserted by going to '''your service provider''''s website and searching for SMS Message Centre.