They sometimes offer free service
This is about identifiers in a record referring to other records.
You can have many to one, one to one, many to many.
E.g., if you have two tables, Authors and Books, then a book record could have a reference to an author record. Since an author can write many books, this would be a many-to-one relationship.
Answer:
Try resetting your device.
Explanation:
In order to send and receive iMessages to your iPhone, iMessage must be enabled. By doing this, you will associate your phone number with the email address used for your Apple ID or iCloud account.
