Hey, Trung! I'm sorry to hear about your mom's lost SIM -- I can't imagine those moments of searching prior to departure (or worse, immediately after arrival home) added anything fun to her trip! From what you're describing, barring any known iPhone number display silliness, it sounds like your wife's SIM number and yours were swapped in error in our store. Were you testing by placing calls, or just checking the number in the about phone section? The good news is, if it was just an accidental SIM swap, we can easily resolve that for you if you merely Contact Us over the phone. Of course if you stop by the store and a new SIM is needed because troubleshooting leads us to that conclusion, we should be able to replace it without issue. Either way, we are definitely sorry for the inconvenience -- it stinks to think that you were helping out your mom and wound up as innocent bystanders experiencing a service issue! Please let us know if you've been able to reach out and get this resolved.