전화가 와서

because I got a call

→ 전화
phrase Rare #23,621
because I got a call 전화가 오다 literally means “a phone call comes” but naturally means “to get a call.” 와서 connects this cause or preceding event to what follows, so it can also mean “I got a call, so…”
KO: 전화가 와서 잠깐 나갔다 왔어요.
EN: I got a call, so I stepped outside for a moment.

이상한 소포 전화가 와서 울리면 그놈 것 같고 무슨 전화?

I’ve been getting strange packages and phone calls, so whenever the phone rings, I think it’s that guy. What kind of call?

— 히든 (2005)

동생 한테서 전화가 와서 기다리고 있었어요

I was waiting because my younger sibling called.

— 마녀배달부 키키 (1989)

주인 전화가 와서 늦었군요

You were late because the owner called.

— 화양연화 (2000)

전화가 와서 놀랐어

I was surprised to get a call.

— 허공에의 질주 (1988)