Which network provider(s) do the CPR Call Blocker support?

Which network provider(s) do the CPR Call Blocker support?

The CPR Call Blocker will work on standard domestic telephone lines from any main phone provider in the UK, including BT, Virgin Media, TalkTalk, Sky, Plusnet etc. 

It will also work with all providers in the U.S.A, such as Comcast, Verizon, AT&T, Ooma, Straight Talk, Century Link/Tel, Time Warner, Cox Communications, etc.
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