You should get it once your sim gets activated. SInce you received your sim earlier than expected, you will not have gotten your registration email yet. Another thing they should include in the instructions
It could be a coincidence. But unless other posts about the same thing shows up, it would be difficult to narrow down to someone hacking the porting process to send spam calls. Robo spam calls for numbers are all automated for dialing, so there is not much value going out of the way to collect numb...
Try a different messaging app and see if the issue persists. You can also go into your settings>Apps>Messages>Memory And here you can clear your cache and data, Note that if you do this you will lose all your past messages
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