LG Decoy VX-8610
LG Decoy VX8610 vs. Samsung SCH-a310
The A310 is no longer offered and is in a whole different category than the decoy. What matters is what you need your phone to do.
From a features standpoint, the Decoy. But if you just need a phone that makes calls and takes calls, then the a310 I suppose.
Time to move onto a model a little more recent. IF you like simple, look into the LG 5400 or Moto W385. They're simple and affordable.
If you like features (at least ones that go beyond sevon colors on the outside scren) then look into the Decoy or LG 8350 or 9400 (depending on budget).
The a 310 is a discontinue phone, it was last sold in 2003