You are able to receive but unable to send short message service (SMS) messages. When you attempt to send an SMS message from your BlackBerryÂ® handheld, an X is displayed beside the message, indicating it has not been sent. When you open the unsent SMS message, Packet Error is displayed. The cause is that your handheld is trying to send out an SMS in a wrong format.
1. From the Home screen on the handheld, go to Options –> SMS.
2. Scroll down to Network To Send Over and click the trackwheel. Select Change Option –> GPRS.
3. Scroll up to Data Coding and click the trackwheel. If the default setting was 7 bit, change it to 8 bit. If the default setting was 8 bit, change it to 7 bit.
4. Click the trackwheel and select Save. If the problem persists, contact your wireless service provider.