Has anyone else noticed that you can have a 5 dot LTE signal and as soon as you answer or make a call, the network immediately jumps to 4G? It happens on my phone all the time. I mainly am on calls on my car's bluetooth or on speaker so I will frequently use data while on a call. I would say that this happens 100% of the time on my 5S and happened probably 80-90% of the time on my 5. Any explanation for this?