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davrh
Contributor
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Recognised/unrecognised numbers

My daughter lives in Singapore and calls me from her Singapore landline. Sometimes her number is recognised and she is able to contact me; at other times her number is unrecognised and the call is blocked. Prior to Call Blocking, Caller Display sometimes showed her number and sometimes showed 'UNAVAILABLE'. I do not understand how the same number can sometimes be recognised and sometimes be unrecognised. What determines whether a number is recognised?

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