Hello, the answers I find was for iphone. I have an android phone and know how to set up block unknown numbers.
I get a pre-paid Telstra Essential Smart handset and it does not work the same as android because when I go into block call options, there is no "Unknown" check bock to check, just a field for me to put a number in.
How do I put in unknown number???
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You can't on that phone. It doesn't have that functionality.