I called Sprint - Germantown near Collierville is a HUGE problem. There is a 3G tower on East Holmes Road that has been facing Capacity issues since September 7th. As a result, your phone can show near full bars and inbound texts/calls may not go through, or outbound calls you make will go to voicemaill or ring but the other party may not receive it - same for texts.
As a result, I got a 20$ credit on my account, as I do alot of business and personal stuff near that tower. They say that we'll be getting LTE soon but we'll see about that..