We are sorry to hear of the issues you are experiencing. Could you ensure you have a MicroSD card, and no third party applications are installed on the phone, and are moved to the SD card. Third party applications take up a lot of memory, so if you have them on the internal memory, it is taking up space that should be used for messages etc. If you go to settings > applications > manage applications, you can check third party applications, and move them to SD card. Alternatively we would recommend backing up all data and performing a reset on the device: Applications - Settings - Privacy - Factory data reset.
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