Is it possible that a dead Iphone would give off a busy signal?

I was trying to call a friend today and I got a busy signal. The phone did not ring and I immediately got a busy signal. The phone was also not receiving imessages or texts. The friend said that their phone died. Is that possible or might they have been doing something to keep calls from coming through?

No.

A busy signal comes from the phone company - not the phone.

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