Yes. Walmart and Best Buy.
Yes
Best Buy too
Yes, there is even a Walmart across the street which might be the cheapest place to get a SIM card.
Yes there is.
Several
There are many places in and around that deal with cell phones. For instance, just a few blocks past is a Sprint store that also does service on Sprint phones, one of the few service centers for Sprint in Columbia. You will find a Best Buy a block away as well. Last time I was in the mall there were cell phone sales. It really comes down to what phone and service you have as to where around there you will go.
Not sure I'm visiting
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