Is my $15 a month plan at it's demise?

[furrycnorm]

Ok, let me lay it out for you. I worked at Best Buy and in 2003 got a sprint plan for $15 a month called Retailer Emp Plan 750. It includes 750 anytime minutes, unlimited text and data. I have been using it just fine and have had a Touch Pro 2 for the past couple years. I just bought an htc evo 4g on ebay and received it today. Upon calling Sprint to switch over to the new esn, I am told that my plan no longer supports smart phones and I will have to switch to an $80 a month plan if I want to use the evo. She said that sprint went away with the old employee plans as of August, 2010 and that I would have to keep the phone I have or get a normal cell phone that isn't a smart phone. Now I am at a rock and a hard place. Do I want to keep my $15 a month plan? Hell yes! Can I go on living my life with a dumb phone? Hell no! My TP2 is on its last leg and I don't know what to do. Anyone have any advice?