I have the same problem. You might try taking a corded phone to the service box outside where the telephone line connects to your house. On the underneath side there is a line jack used for test purposes. Plug your phone in there to see if static is heard. If you hear no static from this test jack, but do hear static from in the house corded phones, you probably have a wiring issue inside the house. If you hear static from the outside test jack, that's the phone companies problem to fix. Hope this helps.
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