is a margin call an actual phone call or just a push notification from your broker?
In the old days, margin call was an actual telephone call because they were no push notifications or modern electronic gadgets with SMS.
Today a margin call no longer comes as a telephone call (except you are a VIP customer trading millions💵 ); for regular traders, it can come as a text message or a push notification from your brokers mobile trading app.
This is why you need to download your brokers mobile app so you dont miss margin call notifications.