It is not abnormal to receive duplicate text messages on occasion. Typically this occurs when the system doesn't receive proper communication that the message has been received by the phone, so it resends the message again. Turning the phone off and back on a daily basis does help prevent some duplicate text messages. It would be abnormal to receive the same message every minute or so over and over again. Should this occur, try deleting all messages in your inbox/outbox. If your phone has a removable battery, take the battery out of the phone for a few seconds. Replace the battery, and turn the phone back on. Also check to see if there are any additional messaging apps installed on the phone that could be causing a conflict with the default messaging application. If that does not resolve the issue, contact Cellcom Customer Care.