In the wake of T-Mobile's recently unveiled Simple Choice plans, Virgin Mobile is capitalizing on the shakeup by playing a value card of its own. Now through May 31st, the Sprint-owned MVNO is offering $100 credit to all T-Mobile subscribers willing to port their number to Virgin Mobile. Study the numbers for yourself and the deal seems a no-brainer, as Virgin matches T-Mobile's unlimited scheme with a monthly bill of only $55, which rings in $5 less than the UnCarr
