Slider T20 - Call Barring Settings; Line Switching Capability; Advanced Call Settings

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for more detail.
5.2.3 Call barring：
The options are “All voice calls”, “International voice calls”,
“International voice calls except to home”, “All voice calls”,
“Voice calls when roaming”, “Cancel all”, “Change barring
password”. Note: This function depends on the network ops”,
“Cancel all diverts”. Note: This function depends on the
network operator. Please ask the local network operator.
Please ask the local network operator for more detail.
5.2.4 Line switching：
Able to switch line 1 or line 2.
5.2.5 Advanced setting:
Auto radial: Able to open or close the function of auto radial.
When it’s on, the phone shall redial automatically after you
failed dialing.