Trade in program? What do they give you 200 to trade in your old 3gs for a new ip4
correct. i just called my local radioshack and they said for a 16G 3GS in good condition the will give $196 with the charger and if you're available for an upgrade you would just pay the difference ($3 +)
and if one of your other lines are up for an upgrade, if yours is not, you can use that one to get it if needed
if you currently still have the unlimited data package make sure to let them know you would like to keep it
not every radioshack does it and availability may be an issue