Call Waiting
THE GALAXY S II offers Call Waiting, so it lets you know when you have an incoming call while you’re already on a call. You can choose to either answer the new call—and put the first call on hold—or ignore it and let it go to voicemail. If you’re a real fast talker, you can even keep both calls going at once and switch back and forth.
When you’re on a call and another call comes in, your screen shows you the phone number of the second caller. The phone won’t ring or vibrate, and at that point, you’re still on the call with your first caller.

You have two choices:
Answer. Answer the call as you would normally, and you can accept the incoming call. You get an “Accept call” notification call on your screen that gives you two choices: Put your first caller on hold and answer the call, or end the first call and answer the incoming call. If you answer the call and put the first caller on hold, you’ll see the same screen as you do for conference calling, and can switch back and forth between the calls or merge them.
Ignore. To ignore the call, ignore it as you normally ignore an incoming call, and proceed with your first call.
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