Yep. There are similar challenges with telephone numbers too ("surely not!" I hear you cry... uh-huh: en.wikipedia.org/wiki/National_con...), and usually our clients want to confirm it's not made up, thus, we adopt similar solutions, such as sending an SMS message, or making an actual call.
Thus the recent FCC warnings about dialing back unknown "local" numbers. Thus, "be careful about calling back".
A couple weeks ago, I received a call that, on my cell, very obviously came from the 20 country-code. However, on my VOIP line's handset - and its simplified display - the number simply appeared as a ten-digit 202NNNNNNN (the 202 area-code is local to me) number.
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