I don't know much about the Samsung Sgh-A516, but in my opinion $75 is a little pricey for a used basic phone, especially since it is locked and one that came out in 2007. Unless you REALLY REALLY REALLY want it. Do a google search and go through the reviews until you find some details concerning the features you want. Or try it out before you buy to make sure it works how you want it to.
Don't forget, if you return your Nokia to the store, you have to give back the sim, and you'll lose whatever airtime you've added to your account. Then you'll have to buy a new sim, most likely from someone on this site (don't know where else you'd get one). Add at least $30 or more for the cost of a SIM.
Here's one review of the phone, it may or may not include all the stuff you need.
http://www.howardforums.com/sh…..?t=1268136