Are you able to receive SMS from users on other carriers? Like T-Mobile for example?
If you do, it installed succesfully.
EDIT: Also, from that same link...
Quote:
What to Expect
To verify if this patch is currently installed on the device launch File Explorer on the device and Navigate to the Windows folder. Within the Windows folder there will be a file named SMSBuildPatch. If you have this file, your device already has the software patch installed.
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