I have questions about the tiny icons displayed across the top of the screen. One is a red square with the letter R inside. What is it and what does the R indicate? That icon is not always visible. There's one that is the number 1 with a little red dot behind it? Also where is the display showing the signal strength? I really like the phone, EXCEPT, the signal strength in my area is unstable and this phone does not do a good job of making/receiving phone calls inside my house. Thanks for your help.