Yhe most bizzare ones are the T-Mobile shops in lower income neighborhoods (usually a franchise) where they don't even sell the top-of-the-line models with the features that you are supposed to ask about. The salesperson usually doesn't know anything about the models of features, and sometimes will just refer you to a Corporate store. I just report it as it happens.
I too know far too much about cell phones and calling plans from the Big Four companies.
IMHO, the best deals on cell phones are to be had at the kiosks at Costco. They have good prices, a price guarantee, and throw in accessories. [Sorry to have strayed off topic.]
Shopping Southeast Pennsylvania, Delaware above the canal, and South Jersey since 2008