How do you activate voice chat in Dead Space 2

Just plug in your mic. If it isn't working there are four possibilities:

1. You might have your mic turned off.
2. Your mic isn't working at the moment, it does this from time to time. Just reset your console.
3. Your mic is broke, you have to get a new one.
4. Parental controls might be blocking conversations from others, that's for you and your parents to deal with.