So, based on Walking Dead’s prior track records with paying attention to how they dress their sets, what they do with the backgrounds of the shots, we have this from FtWD’s second episode.
So for those who really, really care, TWD’s apocalypse starts in August 2010. Which apparently matches up with the models of phones characters are carrying about. iPhone 4s are in a number of hands, pockets, and purses; which came out in June 2010.
Inquiring minds, and food for thought. Eat more brains!