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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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GSM/3G/4G/LTE/… enable or disable caller ID when calling

Posted by jpluimers on 2017/02/13

When testing the setup of a Fritz!Box 7490 with fiber connection, routing anonymous/withheld ISDN calls to a new answering machine I needed to test if only Caller ID calls were getting through.

The easiest was to do this from my mobile phone.

Izzy explained how to in callerid – How can I make anonymous calls for everyone but contact list? – Android Enthusiasts Stack Exchange.

Basically all cellular networks based on GSM or derived technologies allow you to prefix any phone numbers with:

–jeroen

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