I have problem with restore default signal indicator in my iPhone 7 Plus. When I was on iPhone 7 I was able to enter Field Test Mode and switch to numeric DB signal. Then I switch to iPhone 7 Plus with Intel modem and I have numeric signal because of my backup. But on iPhone 7 Plus I can't enter Field test mode and can't restore signal indicator back to default. Can you please give me some advice how to do it? If it's possible? Thanks .