Set a wireless network type for sending text messages
Depending on your wireless service provider and wireless network, this feature might not be supported.
On the home screen, click the Text Messages icon.
key > Options.
In the SMS Text section, do one of the following:
• To use only one network type to send text messages, change the Network To Send Over field to Circuit Switched
or Packet Switched.
• To use either network type to send text messages, which might be beneficial when roaming, change the Network
To Send Over field to Circuit Switched Preferred or Packet Switched Preferred.
key > Save.