Crackling noise on phone - Uniden Cordless Phone

As Andrew Taylor stated, you could have service problem inside, or outside line trouble, is it worse when raining or wet out and better on warm dry days, sure sign of line problems.
You may also have a faulty phone which will act identical to this, as phones get older and dropped often enough, the circuits start to wear,burn,come loose and cause this static or interference.
Unplug all your phones and try a friends known good phone to see if static goes away, if it does, plug your phones back in one at a time, until you find the bad phone or bad phone jack..
press the helpful button

CenturyLink How to troubleshoot for static or noise on your phone line or...

http://support.sasktel.com/app/answers/detail/a_id/15097/~/static-or-crackling-noise-on-your-phone-line

https://iihelp.iinet.net.au/Troubleshooting_Home_Phone_for_Line_Noise

That means the End is near ,,,sorry man , dust ,,water ,,shocked ,,(ie) falling ,,,hard hit ,,, internal damage ,,,

Only one reason for the noise on a power adaptor and you already guessed it - spark jump. Do not use until repaired or replace.

your question is under coffee maker category and it is about toaster.

Anyway your toaster should not make crackling noise indicatve of arching. If it has run its life, change it

connect one of your other phones to the same socket and
check if it works properly. if not the you need to change
the socket.

The audio output section circuit has the fault. Check and replace audio output circuit board as card basis.

you either have a defective battery or a mainboard fault inside the phone.

The router does not have a fan. The crackling noise is bad, router needs to be replaced.

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

open it up and spray it with contact spray. move left and right and then spray again. this will normally do the trick. the crackling noise comes from standing in the same position for to long.