This is probably the most important thing to remember when dealing with the other party’s insurance company: you are under no obligation to tell them anything. The insurance company wants to catch you off guard and get you to say something that will compromise your claim.
If you want, you can confirm that they have the correct person on the phone, but you should tell them that you’ll call them back once you have a lawyer. Don’t answer any of their questions besides asking you your name. Whatever you do, don’t say things like “I’m sorry,” “I didn’t mean to,” or “I’m actually not in that much pain.” All of these statements can be used against you to devalue your claim.