Both Sprint and Verizon users are reporting difficulties getting their phones to roam or hold calls using the standard "automatic roaming" feature in many situations where there is sufficient signal from at least one roamable carrier to make a call but where the primary signal may be weak or intermittent. I'm looking for a custom app to fix this, in particular, on the Samsung Moment. What I envision is either a "roam only mode" or an app that lets you adjust how aggressive the roaming algorithm is. Perhaps something with a slider from "aggressive" to "conservative" that will let you adjust it just enough for your environment but not overdo it and risk getting nasty letter from your carrier. My current option is to buy several pieces of equipment to circumvent this issue in certain buildings. If I could get an app to do this for about the same price or less as all the equipment, I would rather have the app. Any takers?