SPOILERS IN WHITE
In the comics, the phone thing is a release mechanism for Rick. He talks to somebody periodically about joining their group. Eventually, he finds out it's Lori, and he keeps the phone and talks to her anyway until Carl catches him. Lori (and baby) didn't die until the group was driven away from the prison by the Governor. I would have liked to see that scene unfold, but alas we will not.
They are really jumping around a bit in the comic series.
THE Luke Kuechly Super Collector
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