I currently have an iphone 4 on ATT with a grandfathered unlimited data plan. I use a lot of data to the point I am slowed down about 20 days (30GBS+ no thether) into the month. However service where I live is one to two bars of 3G and I often drop calls. My friends and neighbors have full bars 3G on verizon but the 2GB data cap would be hard for me. Does sprint's roaming use verizon's network according to their coverage map I should have decent signal using sprints network but I am also close to a roaming area. I would rather have slow speeds and unlimited data than limited and fast but if the roaming will hurt me I need to complete calls more than downloads. Thanks