Springtime is here. It's a season of renewal, and similarly, an ideal time to replace your aging phone with one that you'll adore. With this in mind, we give you Engadget's smartphone buyer's guide -- your one-stop resource for selecting the best handset that fits your desires and budget. This time around, we're doing things a bit differently. In addition to naming the top phones for each provider, you'll now find more comparisons across carriers. This should help you find the best possible handset -- regardless of network -- if you're willing to make the switch. Also, you'll no longer see limited-time offers as our budget picks -- t
