I have a T-Mobile Samsung Dart (which IIUC is a re-branded Samsung Galaxy Mini) and a Wi-Fi network in my apartment with two access points. When I make Wi-Fi calls while walking from one end of my apartment to the other, the signal from the access point I was originally connected to (AP1) degrades to the point of being unusable. By the time I get to this point the signal from the other access point (AP2) is strong but my phone doesn't roam to AP2.
Both access points are set up with the same SSID and security settings, so roaming should "just work". It does work when the Wi-Fi connection is idle, although it usually takes a long time for the phone to figure out that the signal from AP1 is weak and start using AP2. Using Wi-Fi calling seems to make Wi-Fi roaming even less aggressive, probably because the Wi-Fi NIC is busy sending data instead of scanning for hotspots to roam to.
How do I configure my phone to roam more aggressively between Wi-Fi hotspots on the same network (same SSID and security settings)?