It registers the device with your network. This makes it send the service books that control what plan you have....email, data,sms, MMS things of that nature. Its common to do after wiping the device or upgrading the OS.
I have nothing to add to this thread; I just wanted to bask in the greatness of AG and SD. Carry on.
You are one of a kind bro, always good for a laugh
On the other hand, the only time i really re-register my device is after I update my OS and if you lose your browser icon as AG stated in the above post. Resend your service books if you think your emails are delayed or not coming through as usual, i also do this after every update as well...
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