Over the last couple of days my phone line has developed an annoying buzzing sound in the background when we make or receive calls,it seems worse in the morning and at nightThere has been no changes to my wiring or devices .
It's a normal BT line and I've tried the Quiet line test and all is OK, not even a crackle.I've applied warm hair with a hair dryer in case of damp.
Broadband seems normal.
Any ideas please ?
Decca.



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RobertoS