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You cannot actually block. There is an option to send calls directly to voicemail but to block them you cannot without a 3rd party app.
Contact your carrier/network as they might be able to block numbers for you
As above - You need to save said number as a contact then open said contact and enable the ignore option - This is the same on Samsungs S4 and S5
Thanks for all your help, my question was answered your
Cool.
Please let me know how to block Private / Withheld Numbers on Sony Xperia Z3 Compact