We are a VoIP carrier and we see this happen (ONLY) on t-mobile very frequently. We've spent hours and hours with their support trying to get them to understand, but no luck. It's going on two years since we first reported. At least we now have this thread to point the techs to so we don't have to re-explain it over and over. As Endeavour states, the issue is that at some point, t-mobile is stripping the country code from the number. We (and almost all carriers) use the "e.164" numbering plan. So for example in Seattle with a 206 area code, we would send a number as:+12065551234 where the +1 designates a US number. Now some carriers will strip the +1 if they know it is US, so that is your familiar 10 digit 2065551234What happens at t-mobile - and ONLY t-mobile is they just manage to remove the 1, so then you get:+2065551234What all modern cell phones will do when they get this is pick it up as a +20 area code (Egypt) and display the number as international.(android and apple inc
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