I was at my parents house the other day and noticed with my Thunderbolt they have LTE in their area (not yet announced but confirmed by local store). I turned on my Hotspot and my dad connected his Laptop (Windows XP) no problem. Speedtest.net showed 14MB/sec down. Awesome! I ordered them a 4G Mifi 4510L and set it up the next day. The Desktop computer (Windows XP and WiFi) connects just fine, still gets 5MB/sec + every time but the Laptop (XP) will barely connect if at all. The few times I can get Speedtest.net to even load on the Laptop, it shows insanely slow speeds like .18MB/sec. Outlooks says it isn't even connected even though in the System Tray it says it is. If I turn off the 4510L and start up my Thuderbolt hotspot, the Laptop connects and works fine and gets 4G speeds. I tried plugging the 4510L into the the Laptop via usb, nothing really happened except found new hardware windows but right after disconnecting it from the Laptop, the Laptop finally connected at 4G speeds! No idea why that would change anything. Now today I am back to where I started. Desktop (via WiFi) is working great at 4G speeds but the Laptop barely or doesn't have internet. What gives??? Why doesn the Laptop connect just fine to my Thunderbolt Hotspot at 4G speeds but it doesn't want to connect to the MiFi at 4G speeds? Especially when th Desktop is connecting to the MiFi just fine??