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My parents land line is shite - it’s really crackly
Open a voice fault with BT. If you can hear the crackling then the engineer can too and that is usually easy to get fixed. Shouldn't cost you anything providing you can hear the crackle from the internal socket of the NTE5 (see https://commons.wikimedia.org/wiki/File:BT_NTE5.JPG).
If the Internet is over the phone line (ADSL/VDSL/FTTC) then fixing a voice fault is likely to improve the Internet speed and reliability too.
Random q.
My parents land line is shite - it’s really crackly, and mobile reception is also crap. Is there a way of getting an internet based land line? Or does that not exist?