I've written a few posts in the past where I review prepaid mobile services. Over the years, the top contenders have been Boost Mobile and Virgin Mobile . Recently, T-Mobile has stepped up their game in the prepaid market. It is only slightly surprising, therefore, that an MVNO using the T-Mobile network, Solavei , is now the best value in the prepaid market. Before going further, let me just clarify that Solavei does not position itself as a prepaid mobile service. However, given that you pay for service in advance, have no contract, and do not have subsidized handsets...you know what they say about looking and quacking like a duck. But, that's where the similarities end. If you have an unlocked GSM phone at your disposal, Solavei does not sell handsets, then you can subscribe for unlimited talk, text, and data for only $49/month. At the outset, you do have to buy a SIM card for $10, making your startup cost, sans the handset, around $68 or so. Boost offers unlimi