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How to block your phone number from appearing on a recipient's Caller ID?
In Canada, it used to be dialing *67 + number for a outgoing block call. The Cell phone answers back as "dialing invalid", please refer to user manual.
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Dial #31# before you dial the desired phone number (for HSPA phones). *67 works for EVDO/1XRTT phones.
Yes, for Canada it must be *67 + number. Try to contact your service provider to clarify invalid dialing reasons.