What is the 4 digit code to bar/disable outgoing calls

I tried PIN1, PIN2, 0000, 1111, 1234, 7777 depending on what I've read on internet about this issue, but none of them works

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You could try the Unstructured Supplementary Service Data listed on wikipedia. There are also GSM Network Codes on Howard Forums. There was no documentation in the manual. Additionally, I would look in the Lenovo forums as well.

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