Make a call with hidden caller identification - HTC One
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You can make a single call with hidden caller identification, your number will then not be shown at the receiving end. You can also turn off caller identification for all calls.
Step 1 of 2
Make a call with hidden caller identification
Press the phone icon. Key in #31# followed by the number you want to call.
Step 2 of 2
Make a call with hidden caller identification
Example: #31#012345678 Press CALL.
Make a call with hidden caller identification
Press the phone icon. Key in #31# followed by the number you want to call.