I have Android 6.0 on an HTC One M8 using GiffGaff.
The usual Phone Number availability via Settings>About>Status>Phone Identity doesn't list my phone number.
Might be due to the fact that it's an unlocked Vodaphone phone, but the SIM card was a new one as I switched from my original GiffGaff MicroSD SIM to a GG Nano SIM, which you then have to activate to transfer the number.
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