![Screen Shot 2015-03-09 at 10.38.05 PM](http://siliconalley.com/wp-content/uploads/2015/03/Screen-Shot-2015-03-09-at-10.38.05-PM-161x300.png)
http://www.ubersignal.com/field-test-mode
Go to the phone program of your iPhone, dial *3001#12345#*, hit send, you will go into field mode. It will show you the phones signal strength in numbers. I saved the number in my phone directory under phone signal strength so I can check the signal in numbers easily.