I've been wondering about this for awhile. The iPhone 4 had a pretty good number of problems with cellular connectivity upon release, and several in-depth articles noted specific difficulty handling tower handoffs. At least in the radios I design, this code lives in the baseband software. Everyone's always trying to keep their early baseband to preserve the unlock, but it seems like there could be valid reasons for wanting to upgrade the baseband as well. Cellular connectivity improvements could very well be among those reasons. With an unlock for newer basebands supposedly under development, I wonder if it might be best to take the baseband improvements provided by 4.1 and hope for an unlock later. I'm on AT&T in the US, so I don't need the unlock, but it is nice to maintain for resale value. Any thoughts?