Problems texting with iphone 4

If you are having problems with texting on your iphone 4 you may need to download the 5.0.1 version of Itunes to restore the phone. First, select restore iphone then select back-up phone before restore.Phone will now restore to factory settings then you can sync phone after restore from the backup. After this make sure your phone number is 10 digit without the 1. Also check your other settings.