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I think I just tried it, and it worked.
Old MyTouch 4G phone (which has my duplicate SIM in it) has a setting for 'internet calling', which I enabled.
I was then able to make a call to myself on an even older TREO with a 'regular' SIM in it.
I don't see any indicators to tell me how the call went through.
Since I have been unable to call out from a phone with the duplicate SIM at all until today, I'm pretty excited about that!
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What phone are you trying to use this on? Are you still seeing the issue?
It could also be that you might be missing your e911 address on the line, but that might be a long shot.
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I used iPhone 7 as primary and Le Eco S3 Pro as secondary. Secondary fails to register with error.
I've swapped out and primary SIM in Le Eco S3 Pro works fine, so this is definitely a problem with secondary number not getting WiFi calling on.
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Can you try going to my.t-mobile.com and entering in your address for the accounting number that the duplicate SIM is attached to. You can do this in the profile page.
Let me know if that works.
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That worked. I had to go into my regular account, into profile, settings and then mark "Make this e911 address for all lines" (as there's no visible way to only edit the duplicate line)
After that it started to work. Thanks!
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