I don't know anyone overseas, and would never call an unknown number back. I don't pay a lot of attention to the phone. I pay for caller ID, and programmed our phone to block unknown, unavailable numbers. If an odd number calls more than a couple of times, it gets blocked. Fortunately, I rarely get a call on my cell that is not from someone in my contacts. I ignore it if I don't recognize the number. We've gotten the brace, computer virus, IRS and social security scare messages, laugh and delete them. I figure if it's important and legit, they will leave a message, and I can return the call. Everyone needs to be super vigilant to make sure those scammers don't get one cent of our hard earned money!!