Blackberry's Shows GSM Connection Instead of GPRS or 3G

Sometimes Blackberries lost connections to GPRS or 3G, so they lost ability to receive or send emails -

For example, it only shows GSM or SOS on the network signal 

 

1. Go to "Options" -> "Mobile Network" -> "Network Selection Mode"

 

2. Set "Network Selection Mode" to "Manual"

 

3. Set the connection to a different service provider e.g. from Optus to Telstra

 

4. Set it back to your original service provider e.g. Optus

 

Menu options based on Blackberry Bold series or 8800, may vary on different models.

 

The blackberry should now switch back to GPRS or 3G