Here’s the Secret iPhone Codes That Apple Have Been Hiding From You

#6 Whats the meaning of these numbers?

These numbers are typically expressed as a negative number, If you see numbers between -40 and -80 the signal is strong. Anything below that is a bad signal, and if you're down around -140, you have no signal

#7 Next step is about power button and home button.

Hold down the power button, a power screen will pop up. When it pops up press the home button till the home screen reappears. You'll see on the top left, you'll have numbers which replaces bars or circles that indicated your network. 

#8 Get more accurate signal strength.

Virtually all phones have the "bars" or "dots" graphic that displays on your home screen, supposedly so you know what your cell phone signal strength is. The problem with that graphical representation is that it lacks any kind of standards.

Its a bit complicated process, and requires more efforts, but it works and will give you a precise number for your signal strength. All you have to do is dial *3001#12345#* and then press the call button. A list of options will pop up, just ignore all those options. Follow the next step below.

#9 Blocking your caller ID.

Before you dial a number, you just have to dial #31# and whoever you call won't be able to know that you're the person calling.

#10 You can be completely anonymous.

With the help of this simple hack you can freely call anyone without revealing your identity. 

You can call your crush without letting her know that its you.